Probably one of the most simplistic ways to place advertising on your site is to sign up with Google as one of its AdSense Publishers. The Adsense program displays text ads rather than images on your site. Google then serves ads based on the content on on the page containing their ad code. For example, if we post a tip on our site about email marketing, Google ads will likely deal with email marketing services or products (see our archived tip, How Email Formats May Affect Response Rates, as an example). Just in case any of your competitors show up in these text ads, you have the option to pre-block them with an ad filter. Google pays a percentage of the revenue it earns (it does not disclose exactly what that percentage is) and sends checks to publishers monthly, provided that the publisher has generated at least $100 in ad revenue