Google AdWords - Online Advertising by Google
You may find a lot of advertising resources in the Internet now, but if you're looking for a low-cost, yet highly effective means of advertising your products and services, then Google AdWords may be your answer.
AdWords offers pay-per-click (PPC) advertising, cost-per-thousand (CPM) advertising, and site-targeted advertising for text, banner, and rich-media ads.
AdWords provides advertisers with highly effective text ads that are displayed with the search results.
When your potential customer is looking for something, he or she uses search  (and Google iss one of the most popular Search Engines, receives over 29 million searches each day). When a Google visitor types in their keywords, they are almost instantly presented with their search results. On the right side of the results are colored text boxes containing targeted advertisements that match their search terms.

When you place your ad with AdWords, you will have the ability to select a list of tightly targeted keywords including all of the following:

• Keyword Matching - Shows your ad when a search includes your selected words.
• Phrase Matching - Shows your ad when a search includes your selected phrases.
• Exact Query Matching - Shows your ad when a search contains your exact keywords and no others.
• Negative Keyword Matching - Will not show your ad if a search contains certain words you select.