Use Google to place your ads on other websites

The Google Content Network is a huge network of websites that allow advertising to be placed by Google Adwords withing their pages. 

The following is a list of some of the types of ads that can be placed;

• Simple text ads
• Static image ads (or static banner ads)
• Flash ads
• Audio ads
• Google interactive ads (an interactive "mini-website" within a small ad panel)

Advertising on the content network can be useful for building brands as it is a way of getting visual or text based brand elements regularly in front of the people using sites that mark them as a similar demographic to to the one you want as your customers.