History and growth

In January 1994, Jerry Yang and David Filo were Electrical Engineering graduate students at Stanford University when they created a website named "David and Jerry's Guide to the World Wide Web". David and Jerry's Guide to the World Wide Web was a directory of other web sites, organized in a hierarchy, as opposed to a searchable index of pages. In April 1994, "David and Jerry's Guide to the World Wide Web" was renamed "Yahoo!". The yahoo.com domain was created on January 18, 1995.
Yahoo! grew rapidly throughout the 1990s. Like many search engines and web directories, Yahoo! diversified into a Web portal. It also made many high-profile acquisitions. Its stock price skyrocketed during the dot-com bubble, Yahoo! stocks closing at an all-time high of $118.75 a share on 3 January 2000. However, after the dot-com bubble burst, it settled at a post-bubble low of $4.05 on 26 September 2001 (adjusted for splits).
In 2000, Yahoo! began using Google for search results. Over the next four years, it developed its own search technologies, which it began using in 2004. Yahoo! also revamped its mail service to compete with Google's Gmail in 2007. The company struggled through 2008, with several large layoffs.
In February 2008, Microsoft Corporation made an unsolicited bid to acquire Yahoo! for USD $44.6 billion. Yahoo! subsequently formally rejected the bid, claiming that it "substantially undervalues" Yahoo! and was not in the interest of its shareholders. Three years later, Yahoo! had a stock market capitalization of USD $22.24 billion. Carol Bartz replaced cofounder Jerry Yang in January 2009