Which search engine did Yahoo acquire in 2003 for approximately $1.63 billion?

Yahoo acquired Overture Services in 2003 for approximately $1.63 billion, including cash and Yahoo shares.

Overture, originally founded as GoTo.com, pioneered paid search advertising in which advertisers bid for placement alongside search results. Its technology and commercial model helped establish the sponsored-search market that became central to internet advertising.

Yahoo’s purchase gave it control of Overture’s search-advertising platform and relationships with major search partners. Overture had already acquired AltaVista and AlltheWeb before Yahoo bought the company, so the transaction brought additional search assets into Yahoo’s portfolio.

The answer is Overture Services, not AltaVista. AltaVista was a search engine owned by Overture, while Overture was the corporate acquisition target. Yahoo later integrated Overture’s technology into its own advertising and search operations.