Google AdWords & Page Relevance
Back in the day (2005 or so) you could sign up for a Google AdWord account, and within a few hours you were buying keywords and driving traffic to your website, but then came the iPod, and Viagra merchants offering free laptops and X Box consoles. You see what was going on back then; folks were creating Google AdWord accounts for their websites then they were bidding on whatever words they thought would to drive traffic to their site, regardless if the words were relevant to the page content. (Bait and Switch), for example I am a company that is having a very hard time giving away new laptops and iPods I am up to my eyeballs with these fancy electronic devices, so I go to Google and buy an ad-word campaign for Viagra hoping to trick folks with ED to go to my website and sign up so that I can send them brand new iPods, Laptops and xBox consoles. After a little while there were bunch of very frustrated men that needed Viagra but were conned into signing up to get a mailbox of the latest trendy electronic gizmos
Then the folks at Google implemented a solution to help all these poor men that had too many iPods and laptops, their solution was to make AdWords match the content on the linked website, that way when you are buying an AdWord campaign for Viagra and your website had to sell or at least mention Viagara or ED or something related to Viagra as well as the words in your ad. If your site didn’t mention ED, Viagra, or ED such related things, your cost per click (CPC) would be either prohibitively expensive or your ad would be banned all together.
Now it’s 2009 and things have gotten even more strict over at Google, with all of the competition in the search Engine PPC (pay per Click space) (Yahoo and Microsoft have partnered to compete with Google) companies want to be sure and supply value to their clients, in the Search Engine Owners case (Google) they want to make sure that they are supplying relevant and quality results to the folks that are using their search engines. This is very important because if you go to your favorite search engine and click on a link that doesn’t take you to anything that remotely resembles the ad you clicked on, you will become frustrated and will think twice before you click any ad link on the search engines site, thus hurting the ad sellers business.
Search Engines are very concerned with providing value to both their searchers and their advertisers, this task is very hard to accomplish and the search engines are constantly trying to ensure that their user base it getting the results that they want.
SO BOTTOM LINE: make your AdWord campaign match your sites content, and use AdWords to augment not replace organic search results.