Adwords is Google's primary online advertising product. It generates over 90% of Google's revenue. Adwords allows online advertisers to write short ads that are displayed next to or above search results on Google or on relevant websites that are affiliated with Google through the Adsense program. The Advertisers bid on keywords of their choice and Google selects the relevant ads based on the keywords, highest bidder and previous success of the add. Advertisers are rewarded with more traffic for quality web sites and other criteria. Yahoo and Microsoft have similar products, but none of them are as successful as Google's Adwords.

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