The search feature is designed to help you find the website your are interested in. For example if you would like to find free stuff type "free" in the text area under the counter of busy and available pixels and press search button. The next thing you see when the page reloads are highlighted advertisements with frase "free" in the describtion or the url of the website it is linking to. All other pixel images are less visible to intensify the effect. That way you will find the website you are looking for much faster then before.
You can see the difference very clearly in the pictures below:
