Google AdSense is a free and comprehensive service that makes it easier for website developers to incorporate ads into their online content. Technically, it's a program that generates relevant banner ads and sponsored links based on the content of a website, then supplies a steady rotation of these ads (usually three per site) throughout the year. The ads themselves are determined by the website and its visitors, and webmasters don't have to interact with the sponsors directly or conduct any transactions with anyone but Google. If the ads perform well, the owner of the content receives a check from Google AdSense that represents the money those advertisers paid. Some people wait a year for their first check, while others derive a regular income from Google AdSense.