Google offers two advertising programs: Google AdWords for advertisers and Google AdSense for Web publishers. Go to Google, and select Advertising Programs
The AdWords program reaches people actively looking for information related to the product or services offered by your business, and sends targeted visitors directly to your Web site. AdWords uses cost-per-click pricing, which means you pay only when people click on your ad. There is a nominal, one-time activation fee for Google AdWords. After that you pay only for clicks on the AdWords ads, which you control by telling Google how much you are willing to pay per click and per day.
With AdWords, ads for your business appear alongside or above results on Google search results pages for Google Web search, Google Groups, and the Google Directory. Ads can also appear on the search and content sites and products in the Google Network, which is an extensive online advertising network. Google's global search network includes: America Online, Netscape, CompuServe, AT&T Worldnet, AskJeeves, The New York Times, Earthlink, and Shopping.com. Google's content network of consumer and industry-specific Web sites includes: USNews.com, ABC.com, TheStreet.com, What You Need to Know About.com, Economist.com, Thomson, Lowestfare.com, Lycos, InfoSpace, National Geographic, Viacom, Forbes, FoxSports, LinuxWorld.com, and Macworld.