Google vs Yahoo

Google has a far more successful search-engine business. Google's online spreadsheet and word processing software have no competitor on the Yahoo side.

Yahoo and Google both have highly successful web-mail and "listserv" services.

Yahoo and Google both base their business on advertising revenues.

Yahoo's advertising business is being merged with Microsoft's Bing search advertising.

Google is a much larger company and has a wider variety of products, including a web browser and a mobile phone operating system.