Here is a great video from Hal at Google. It explains clearly how SEM (Adwords – pay-per-click) works
If you are a business owner or dental practice, Pay Per- Click may be the most sensible way to increase the quantity of new patients you get from the web. Our custom PPC advertising strategies correctly targets prime quality, local web traffic that convert into new leads and business. At Smart Web Canada, we don’t focus on clicks. We’re employed to extend the quantity of new leads you receive from PPC.