Yahoo! built on Acquisitions

Yahoo! was founded by Stanford University graduate students Jerry Yang and David Filo in January of 1994 and incorporated on March 1, 1995.
Yahoo provides a range of products and services including a web portal, a search engine, Yahoo! Directory, Yahoo! Mail. It has grown through continuous innovation and acquisitions. Here is the list of acquisitions which helped Yahoo! grow.

1997Net Controls, Web search engine which helped Yahoo develop Yahoo! SearchFour11, Web-based email which helped Yahoo develop Yahoo! Mail

1998Classic Games, Online game, which helped Yahoo develop Yahoo! GamesSportasy , Fantasy sport, which helped Yahoo develop Yahoo! Fantasy SportsViaweb ,Web application which helped Yahoo develop Yahoo! StoreWebcal , Calendaring software which helped Yahoo develop Yahoo CalendarYoyodyne,Direct marketing which helped Yahoo develop Yahoo! Search MarketingHyperparallel, Data analysis which helped Yahoo develop Yahoo! Search

1999Log-Me-On, Digital identity which helped Yahoo develop Yahoo!Broadcast.com, Internet radio which helped Yahoo develop LAUNCHcastEncompass, Internet service provider which helped Yahoo develop Yahoo!GeoCities , Web hosting service which helped Yahoo develop Yahoo! GeoCitiesOnline Anywhere , Content delivery network which helped Yahoo develop Yahoo! TV

2000Arthas.com, E-commerce payment systems which helped Yahoo develop Yahoo! StoreMyQuest , Internet service provider which helped Yahoo develop Yahoo!eGroups , Electronic mailing list which helped Yahoo develop Yahoo! GroupsKimo, Web portal which helped Yahoo develop Yahoo!

2001Sold.com, Online auction tools which helped Yahoo develop Yahoo! ShoppingLAUNCH Media , Online music store which helped Yahoo develop Yahoo! Music

2002Hotjobs.com , Job search engine which helped Yahoo develop Yahoo! HotJobsInktomi Corporation , Internet service provider which helped Yahoo develop Yahoo! Search

2003Overture Services, Inc., Search engine marketing which helped Yahoo develop Yahoo! Search Marketing

20043721 Internet Assistant , Browser Helper Object which helped Yahoo develop Yahoo! AssistantKelkoo, Price comparison service which helped Yahoo develop KelkooOddpost , Web-based email which helped Yahoo develop Yahoo! MailMusicmatch Jukebox , Audio player which helped Yahoo develop Yahoo! MusicThe All-Seeing Eye, Game server browser which helped Yahoo develop Yahoo! GamesStata Labs, Web-based email which helped Yahoo develop Yahoo! MailWUF Networks, Mobile media which helped Yahoo develop Yahoo! Mobile

2005Verdisoft, Computer software which helped Yahoo develop Yahoo! MobileStadeon , Online game which helped Yahoo develop Yahoo! GamesLudicorp, Image hosting service which helped Yahoo develop FlickrTeRespondo , Advertising network which helped Yahoo develop Yahoo! Search MarketingDialpad, Voice over Internet Protocol which helped Yahoo develop Yahoo! Voiceblo.gs, Weblog software which helped Yahoo develop Yahoo! 360°Konfabulator , Widget engine which helped Yahoo develop Yahoo! WidgetsUpcoming.org, Calendaring software which helped Yahoo develop Yahoo! LocalWhereonearth, Web mapping which helped Yahoo develop Yahoo! Mapsdel.icio.us, Social bookmarking which helped Yahoo develop del.icio.us

2006Webjay, Online music store which helped Yahoo develop Yahoo! MusicSearchFox, Web search engine which helped Yahoo develop Yahoo! SearchMeedio, Digital video recorder which helped Yahoo develop Yahoo! GoJumpcut.com, Online video editing which helped Yahoo develop Yahoo! VideoAdInterax, Online advertising which helped Yahoo develop Yahoo! Search MarketingBix.com , Social media which helped Yahoo develop BixKenet Works, Mobile software which helped Yahoo develop Yahoo! MobileWretch, Virtual community which helped Yahoo develop Wretch

2007MyBlogLog, Social network service which helped Yahoo develop MyBlogLogRight Media, Online advertising which helped Yahoo develop Yahoo! Search MarketingRivals.com, College football which helped Yahoo develop Yahoo! SportsBlueLithium, Advertising network which helped Yahoo develop Yahoo! Search MarketingBuzzTracker, News site which helped Yahoo develop Yahoo! NewsZimbra, Collaborative software which helped Yahoo develop Zimbra

2008FoxyTunes, Browser extension which helped Yahoo develop FoxyTunesMaven Networks , Video on demand which helped Yahoo develop Yahoo! VideoInquisitor, Browser extension which helped Yahoo develop Inquisitor

The growth of the Yahoo is function of acquisition or innovation or innovation backed by acquisition is matter of debate.