AdWords is Google's flagship advertising product and main source of revenue. Google's total advertising revenues were USD$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 Mountain View, California, with major secondary offices in Ann Arbor, Michigan, the company's third-largest US facility behind its Mountain View, California, headquarters and New York City office. Engineering for AdWords is based in Mountain View, California.