Answer: I personally believe that there are no exact things that one company possesses all range of specialty but different company possess different specialty. Like Google, it generally possesses the link-based text of advertising. One of its programs, Adwords stands a priority source of income for Google Inc (Wikipedia a, 2010). These advertisements administrated by Adwords generate revenue by cost-per-thousand (CPM) advertising, pay-per-click (PPC) advertising and site-targeted advertising for text, banner, and rich-media ads (Wikipedia b, 2010).
Feature like advertisement targeting which is refined with Internet Protocol (IP) address exclusion is offered by Adwords (Inside Adwords, 2010). It is capable of controlling advertisement placements through methods such as location and language targeting. Hence, this feature enables advertisers and consumers to specify IP address ranges, and also where they do not want their advertisements to appear. In another words, it enables features such as links forwarding to relating websites (Perry Marshall, 2010).
On the other hand, Yahoo contains image, audio, as well as video attachments which possess emotional advertising. It generates revenue on search advertising, online classifieds and a host of commission-generating business such as web portal, search engine (Yahoo! Search, 2010),Yahoo! Directory, Yahoo! Mail, Yahoo! News, advertising, online mapping (Yahoo! Maps,2010), video sharing (Yahoo! Video, 2010),and social media websites & services. About 88% of the total revenues for the financial year 2009 came from marketing services. The largest segment of it comes from search advertising, where advertisers bid for search terms to display their advertisements on the search