Jerry Yang and David Filo, Electrical Engineering graduate students at Stanford University, founded a website named 'Jerry and David's Guide to the World Wide Web', which was later renamed 'Yahoo!'. The word 'YAHOO' is a backronym for 'Yet Another Hierarchically Organized Oracle' or 'Yet Another Hierarchical Officious Oracle'.

In March 1994, "Jerry's Guide to the World Wide Web" was rebranded as "Yahoo!".

In April 1994, 'Jerry's Guide to the World Wide Web' was renamed to 'Yahoo' by its creators Jerry Yang and David Filo while they were studying at Stanford University.

Yahoo was founded in 1995 by Stanford University engineering students, Jerry Yang and David Filo. It has been a pioneering force on the internet, connecting people to their interests.

The 'yahoo.com' domain was created on January 18, 1995.

On March 2, 1995, Yahoo! was incorporated after Jerry Yang and David Filo realized the massive business potential of their website.

Michael Moritz of Sequoia Capital provided Yahoo! with two rounds of venture capital, raising approximately $3 million on April 5, 1995.

On April 12, 1996, Yahoo! had its initial public offering, raising $33.8 million by selling 2.6 million shares at the opening bid of $13 each.

On March 8, 1997, Yahoo! acquired online communications company Four11, and its webmail service, Rocketmail, became Yahoo! Mail.

Yahoo! acquires Four11 for approximately $94 million in stock, expanding its portfolio and influence in the tech industry.

Yahoo! acquires Viaweb for $49 million and rebrands it as Yahoo! Store, strengthening its e-commerce capabilities.

Yahoo! expands its business portfolio by acquiring direct marketing company Yoyodyne Entertainment, Inc., enhancing its marketing and entertainment offerings.

Yahoo! acquires Geocities for $4.58 billion in stock.

Yahoo! acquires Broadcast.com for $5.7 billion in shares.

Yahoo stocks close at an all-time high of $475.00 (pre-split price) a share, making them the most valuable company in the world at the time.

At the height of the Dot-com tech bubble, shares in Yahoo Japan became the first stocks in Japanese history to trade at over ¥100,000,000, reaching a price of 101.4 million yen ($962,140 at that time).

Yahoo.com experienced a temporary halt due to a distributed denial of service attack (DDoS), causing its shares to rise by about $16, or 4.5 percent, the following day.

In the case of LICRA v. Yahoo!, a French judge ordered Yahoo to ban Nazi-related sites from its search engine and to stop acting as an intermediary on bids for objects with racist overtones. Yahoo initially denied the French court's jurisdiction but eventually quit voluntarily trading on Nazi and Ku Klux Klan bibelots.

On June 26, 2000, Yahoo! and Google signed an agreement which would tap the Google engine to power searches made on yahoo.com.

Yahoo acquired eGroups, a significant move in its expansion and development.

Yahoo CEO Tim Koogle announced his decision to step down from the position, opting to remain as a company board member.

Terry Semel was announced as the new CEO of Yahoo, succeeding Tim Koogle in leading the company.

In September 18, 2001, hacker Adrian Lamo satirically modified older Yahoo! News stories and highlighted security flaws. Despite this, no charges were filed.

On September 26, 2001, Yahoo! stock closed at an all-time low of $8.11.

On December 27, 2001, Yahoo bid $436 million for the job search engine HotJobs, successfully defeating rival TMP Worldwide (Monster.com).

On February 13, 2002, Yahoo! finalized its acquisition of HotJobs.

On June 3, 2002, SBC and Yahoo! launched a national co-branded dialup service.

In June 2003, BT Openworld announced an alliance with Yahoo!

In July 2003, Yahoo! acquired Overture Services, Inc.

In November 2003, Yahoo set the Guinness World Record for Largest Simultaneous Yodel.

Yahoo! announces the establishment of Yahoo Research Labs, a research organization dedicated to developing new technologies and solutions for Yahoo!. Dr. Gary William Flake, Yahoo!'s Head and Principal Scientist, leads the new organization.

On February 18, 2004, Yahoo! dropped Google-powered results and returned to using its own technology to provide search results.

Yahoo! discontinues using Google-powered results and introduces its own web-crawling algorithm with its own site index.

Yahoo announces the implementation of paid inclusion for its search service, while still relying mainly on a free web crawl for most of its search engine content.

Yahoo acquires the European shopping search engine Kelkoo.

Yahoo acquires the email provider Oddpost.

Yahoo launches the beta version of its video search engine.

On February 9, 2005, Yahoo! changed its Yahoo! Launch service to Yahoo! Music, offering streaming audio, music videos, Internet radio, exclusive artist features, and music news.

On February 15, 2005, Yahoo! established its European headquarters in Dublin, Ireland, creating 400 new jobs.

Yahoo! launched a developer network on February 28, 2005, providing an API to most of its search verticals.

On March 2, 2005, Yahoo completed ten years of corporate existence and gave away free ice cream coupons at U.S. Baskin-Robbins stores to its users.

On March 20, 2005, Yahoo! acquired the photo sharing service Flickr and its creator Ludicorp.

Yahoo! launched the blogging and social networking service Yahoo! 360° on March 29, 2005.

On April 7, 2005, the Wikimedia Foundation announced Yahoo support.

On May 26, 2005, Yahoo announced its new PhotoMail service.

In June 14, 2005, Yahoo acquired the VoIP provider DialPad Communications.

On July 15, 2005, Yahoo announced Yahoo! Research Berkeley.

Yahoo acquires widget engine software Konfabulator and transforms it into a free software platform renamed Yahoo! Widgets.

Yahoo acquires 40 percent of Alibaba.com for $1 billion, and Alibaba takes over the operation of Yahoo China.

On August 23, 2005, Yahoo! and Verizon launched an integrated DSL service.

Yahoo supplies information to the People's Republic of China leading to the imprisonment of reporter Shi Tao for ten years. Yahoo states that it was following Chinese law.

Yahoo purchases online social event calendar Upcoming.org.

On October 13, 2005, Yahoo! and Microsoft announced that Yahoo! and MSN Messenger would become interoperable.

Yahoo buys British location technology company Whereonearth Ltd.

The sports section of My Yahoo! is hacked, with titles such as 'selfhood + conscience' and 'aesthetic freedom' linking to various pages at doublereflection.org.

TiVo and Yahoo! formed a partnership allowing several Yahoo! features to be accessed on television through the Series2 TiVo set top box.

Australia's Seven Network combined its online, mobile, and internet TV business with the local arm of Yahoo!, leading to the commencement of Yahoo!7 in January 2006. Yahoo!7 covered major events like the Australian Open tennis tournament and the Winter Olympic Games in 2006.

Yahoo! acquired del.icio.us on December 9, 2005.

Yahoo! acquired WebJay on January 9, 2006.

Yahoo! launched the Yahoo! Developer Network PHP Center on February 12, 2006.

Yahoo! launched Yahoo! Tech on May 1, 2006.

On August 31, 2006, Yahoo! Research Berkeley, California was established in association with the School of Information at the University of California, Berkeley.

Yahoo! acquired the online video editing site Jumpcut on September 27, 2006.

Yahoo! hosted an Open Hack Day on September 29 to 30, 2006, featuring a musical performance by Beck.

Yahoo! announces a major re-organization, involving the departure of key executives and the promotion of Sue Decker to the position of CFO. The re-organization also includes shifts in various business units.

Yahoo! announces Yahoo!Xtra, a joint venture between Yahoo!7 and Telecom NZ in New Zealand. This marks a significant expansion of Yahoo!'s presence in the region.

Yahoo acquires MyBlogLog, a social network for the blogging community, as part of its expansion and diversification strategy.

Yahoo launches its new search advertising system, Panama, aiming to enhance its advertising capabilities and compete more effectively in the online advertising market.

Yahoo!Xtra, a localized internet portal for New Zealand, is launched, further strengthening Yahoo!'s presence in the region and catering to the local audience.

Yahoo! announces the acquisition of Right Media, a leading online advertising exchange platform, to strengthen its position in the digital advertising market.

Yahoo! officially retires the Yahoo! Auctions service, signaling a shift in its e-commerce strategy and focus on other areas of its business.

Yahoo! co-founder Jerry Yang replaces Terry Semel as CEO, marking a significant leadership change at the company.

Yahoo! agrees to acquire Rivals.com.

On June 28, 2007, Yahoo! UK/Ireland online auctions closed, but the Hong Kong sites were not affected.

On July 18, 2007, Yahoo acquired a 35 percent stake in Indian online advertising company Tyroo Media Pvt Ltd.

In August 2007, Yahoo! began shutting down Yahoo! Photos to transition users across to Flickr, completing the shutdown on September 20, 2007.

On August 27, 2007, Yahoo! released a new version of Yahoo! Mail, which included Yahoo! Messenger integration and free text messages to mobile phones in the U.S., Canada, India, and the Philippines.

On September 4, 2007, Yahoo! announced the acquisition of BlueLithium, a company founded by industry pioneer Gurbaksh Chahal.

On January 29, 2008, Yahoo! announced the layoff of 1,000 employees due to its inability to effectively compete with industry search leader Google, representing 7 percent of the company's workforce.

Microsoft made an unsolicited takeover bid to buy Yahoo! for $44.6 billion in cash and stock after its friendly takeover offer was rebuffed by Yahoo!.

On February 4, 2008, Yahoo! and Rhapsody announced a strategic partnership in digital music.

Yahoo! decided to reject Microsoft's offer as 'substantially undervaluing' Yahoo!'s brand, audience, investments, and growth prospects.

On February 12, 2008, Yahoo! acquired Maven Networks, Inc. This acquisition was a strategic move to enhance Yahoo!'s video advertising platform and expand its online video services.

Two Detroit-based pension companies sued Yahoo! and its board of directors for allegedly breaching their duty to shareholders by opposing Microsoft's takeover bid and pursuing 'value destructive' third-party deals.

Microsoft CEO Steve Ballmer sent a letter to Yahoo!'s board of directors stating that if within three weeks they had not accepted the deal, Microsoft would approach shareholders directly in hopes of electing a new board and moving forward with merger talks (a hostile takeover).

Microsoft withdrew the offer after offering to raise its offer by $5 billion to $33 per share, while Yahoo! demanded $37 per share.

Following Microsoft's withdrawal, Yahoo!'s stock plunged some 15% lower to $23.02 per share in Monday trading and trimmed about $6 billion off of its market capitalization.

Yahoo! announced that it had ended all talks with Microsoft about purchasing either part of the business or all of the company and announced a non-exclusive search advertising alliance with Google.

Microsoft said it would reconsider proposing another bid for Yahoo! if the company's nine directors were ousted at the annual meeting.

Yahoo! settled with Carl Icahn, agreeing to appoint him and two allies to an expanded board.

On November 17, 2008, Yahoo! co-founder and CEO Yang stepped down from his position, just 18 months after assuming the role. This leadership change marked a significant transition for the company.

On November 20, 2008, Yahoo!'s stock (YHOO) dropped to a 52-week low, trading at only $8.94 per share, almost 10 months after Microsoft's initial offer of $33 per share.

On November 30, 2008, Microsoft offered to buy Yahoo!'s search business for $20 billion.

On December 10, 2008, Yahoo! began laying off 1,520 employees around the world as the company managed its way through the global economic downturn.

On January 13, 2009, Carol Bartz joined Yahoo! as the new CEO. Her appointment brought a new era of leadership to the company.

On July 21, 2009, Yahoo! launched a new version of its front page, called Metro, allowing users to customize it through the prominent 'My Favorites' panel on the left side and integrate third-party web services and launch them within one page.

On July 28, 2009, an agreement was reached in which Yahoo! would use Microsoft’s search engine, Bing, for its website and would handle premium advertisements for Microsoft’s website, an arrangement scheduled to last for 10 years.

On July 29, 2009, Microsoft and Yahoo! announced a 10-year deal where Microsoft would have full access to Yahoo!'s search engine to be used in future Microsoft projects for its search engine, Bing.

In March 2010, Yahoo! acquired sports mobile and social gaming startup Citizen Sports. This strategic acquisition provided Yahoo! with valuable mobile assets and talented personnel.

In July 2010, Yahoo! announced a search alliance with Microsoft, marking a significant collaboration in the search engine industry.

In August 2010, Yahoo! replaced its organic search results with results from Bing, signifying a major shift in its search engine strategy.

In October 2010, Yahoo! acquired Dapper, a move aimed at enhancing its advertising and data management capabilities.

On September 6, 2011, CEO Bartz was fired from her position at Yahoo!, marking a significant leadership change within the company.

On January 4, 2012, Scott Thompson, former President of PayPal, was named the new chief executive officer of Yahoo!.

On March 14, 2012, Yahoo! filed a lawsuit against Facebook over ten patents, to which Facebook responded by counter-suing Yahoo!

On April 4, 2012, Yahoo announced a cut of 2,000 jobs or about 14 percent of 14,100 workers employed by Yahoo, aiming to save around $375 million annually after the layoffs are completed at the end of 2012.

In April 2012, Scott Thompson re-organized Yahoo!, defining customers as both users and advertisers, and creating three major groups for Yahoo! – Consumer, Regions, and Technology.

In May 2012, it was revealed that Scott Thompson's biography at Yahoo contained incorrect information about his academic credentials, leading to a crisis within the company. The revelation was made by Dan Loeb, the founder of Third Point LLC, which held a significant stake in Yahoo.

On May 13, 2012, Scott Thompson was replaced by Ross Levinsohn as the interim CEO of Yahoo following the controversy surrounding his academic credentials.

On May 21, 2012, Yahoo! sold half of its stake in Alibaba Group for $7.1 billion in cash and stock.

Yahoo! and Facebook reach an agreement to settle their patent dispute, ending the legal battle between the two tech giants.

Marissa Mayer is appointed as the CEO of Yahoo!, bringing her extensive experience from Google to lead the company.

Levinsohn, the former interim CEO of Yahoo!, departs from the company, marking a significant change in its leadership.

Yahoo! announces the completion of the initial phase of the Alibaba share repurchase, a significant financial move expected to bring substantial returns to the company.

Yahoo! hires Henrique De Castro as its chief operating officer, adding new leadership to the company's executive team.

Yahoo! announces the replacement of CFO Tim Morse with Ken Goldman, signaling a change in the company's financial leadership.

Yahoo! acquires Stamped, a significant move to expand its portfolio and offerings in the tech industry.

Yahoo! acquires OnTheAir, further strengthening its position in the tech market through strategic acquisitions.

Yahoo! announced changes to its product offerings, including shutting down some and updating others. The Yahoo! Message Boards site was closed on April 1, and the Yahoo! updates API were no longer supported after April 16.

Yahoo! acquired Summly on March 25, 2013.

Fred Amoroso announced his immediate resignation as Yahoo chairman on April 26, 2013, and would be leaving the board in June 2013.

Yahoo announced a partnership with Twitter to include relevant tweets in their homepage news feed on May 16, 2013.

The Wall Street Journal reported that Yahoo!'s board approved an all-cash deal to purchase the blogging website Tumblr for $1.1 billion on May 19, 2013. David Karp, the company's CEO and founder, will remain a large shareholder.

The revamp of Yahoo-owned photography service Flickr was launched in Times Square, New York, U.S. The event was attended by the city's mayor and a large contingency of journalists. Yahoo announced the new tagline 'biggr, spectaculr, wherevr' and provided Flickr users with a free terabyte of storage. The official announcement of the Tumblr acquisition was also included in the event.

Yahoo! bids between $600 and $800 million for video streaming site Hulu. The combination of the two audiences can place Yahoo! in the second-most popular position after Google Video.

Yahoo! moves the official Yahoo! blog from Yahoo! Yodel to new acquisition Tumblr and uses the URL 'http://yahoo.tumblr.com/'.

Yahoo! announced the closure of twelve services, including Yahoo! Axis, RSS Alerts, and Alta Vista.

Yahoo! acquired Xobni and appointed its former CEO, Jeff Bonforte, as Senior Vice President of Communications Products.

Yahoo! announced the scheduled closure of the May 2013 acquisition, Astrid, with the task management service to be discontinued on August 5, 2013.

On August 2, 2013, Yahoo Inc announced the acquisition of social web browser concern RockMelt, integrating its team and services into Yahoo.

Yahoo! launched a month-long logo change display.

At around midnight EDT on August 7, 2013, Yahoo! announced the introduction of the final version of the new logo on September 5, 2013, marking the occasion with a '30 days of change' campaign.

On January 3, 2014, a malicious exploit was detected in Yahoo!'s ad network by Fox-IT, affecting a significant number of users in Romania, France, and the UK. The malware targeted Java and raised serious security issues for Yahoo! users.

On February 11, 2014, Yahoo! acquired Wander, integrating its team into Yahoo's mobile and emerging products unit in New York City, signifying Yahoo!'s strategic expansion in the mobile technology sector.

On February 13, 2014, Yahoo! acquired Distill, indicating Yahoo!'s focus on enhancing its technology and talent pool through strategic acquisitions in the tech industry.

Yahoo! denies any knowledge of the interception and collection of webcam images by GCHQ, Britain's surveillance agency, who with aid from the US NSA, intercepted Yahoo webcam images of millions of individuals not suspected of wrongdoing.

On March 12, 2014, Yahoo officially announced its partnership with Yelp, Inc.

Yahoo acquired video streaming platform RayV.

Yahoo announced that it is buying mobile ad company Flurry.

Yahoo! Japan announces plans to buy travel booking site Ikyu for approximately $830 million.

Verizon agrees to purchase Yahoo's operating business for $4.8 billion.

On September 22, 2016, Yahoo disclosed a data breach in which hackers stole information associated with at least 500 million user accounts in late 2014, marking one of the largest technical breaches reported to date.

On December 14, 2016, a separate data breach occurring around August 2013 was reported, affecting over 1 billion user accounts and considered the largest discovered in the history of the Internet.

On January 9, 2017, Marissa Mayer announced she would step down from Yahoo's board of directors if its sale to Verizon, of $4.5 billion, went through, and that Yahoo! would rename itself to Altaba upon the deal's closure.

On June 8, 2017, Yahoo shareholders approved the company's sale of some of its Internet assets to Verizon for $4.48 billion.

Verizon officially acquires Yahoo!, consolidating its assets in the subsidiary company Oath and ending Yahoo!'s existence as an independent corporate entity. CEO Mayer resigns from the company via her Tumblr account.

Yahoo sells its photo-sharing platform Flickr to SmugMug.

Yahoo's parent company, Oath INC., re-brands and changes its name to Verizon Media Group, signifying a strategic shift in its corporate identity.

Yahoo announces the impending closure of Yahoo Answers, a significant decision after 16 years of operation.

Apollo Global Management enters an agreement with Verizon to acquire Verizon Media, including Yahoo! and AOL Brands, for $5 billion, leading to the formation of a new company known as Yahoo.

Yahoo Answers ceases its services after 16 years of active operation, marking the end of an era for the platform.

Apollo Global Management completes the acquisition of Yahoo, formerly known as Verizon Media.

Yahoo and Marriott collaborate to establish a unique travel media network, offering exclusive supply partnerships to extend scale and connect businesses with audiences.

Ex-Yahoo CEO Marissa Mayer discusses the current tech scene from the vantage point of her AI startup. This indicates her continued influence and involvement in the tech industry.