AdWords is Google's flagship advertising product and main source of revenue ($21 billion in 2008). AdWords offers pay-per-click (PPC) advertising, and site-targeted advertising for both text and banner ads. The AdWords program includes local, national, and international distribution.

Google's text advertisements are short, consisting of one title line and two content text lines. Image ads can be one of several different Interactive Advertising Bureau (IAB) standard sizes. Sales and Support for Google's AdWords division is based in Ann Arbor, Michigan, the company's third-largest facility behind its Mountain View, California, headquarters and New York City office.Engineering for AdWords is based in Mountain View, California.

Advertisers specify the words that should trigger their ads and the maximum amount they are willing to pay per click. When a user searches Google's search engine on www.google.com or the relevant local/national google server (e.g. www.google.co.uk for The United Kingdom), ads (also known as creatives by Google) for relevant words are shown as "sponsored links" on the right side of the screen, and sometimes above the main search results.

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