What is google adwords

[tim.alter]

AdWords is Google's flagship advertising product and main source of revenue. Google's total advertising revenues were USD$23 billion in 2009[2]. AdWords offers pay-per-click (PPC) advertising, and site-targeted advertising for both text, banner, and rich-media ads. The AdWords program includes local, national, and international distribution. Google's text advertisements are short, consisting of one headline and two additional text lines. Image ads can be one of several different Interactive Advertising Bureau (IAB) standard sizes.