YPN (Yahoo Publishers Network) is an advertising program run to Yahoo. Web site owners can enroll in this program to enable text and image advertisements on their sites. These ads are administered by Yahoo and generate revenue on a per-click basis.
Yahoo Publisher Network, Google AdSense etc. are all clamoring for Internet space to host their advertisements.The boxes made are usually pretty obvious, marked with "Ads by Google" or "Ads by Yahoo." So how much can you make off this sort of Internet marketing?