If a website gets high traffic then the ads that are posted on them get more exposure, the chances of the users clicking on the ads as they become interested in them and also buying those increases significantly. The importance of great content is that it drags the users to the website where the ads are placed on a similar theme. The user may have been looking for something similar and they may get interested to actually buy the product after reading the content. As the commission that is paid by the sellers of these ads is based on number of sales that have been made, it is important that a sale actually happens and only then the income can be generated for the website owner. Foremost step is to find things in which one has an expertise and can contribute something that is not already available and draws many people. Learn about affiliate marketing here.