Black Hat search engine optimization is usually defined as techniques that are used to get higher search rankings in a corrupt method. Many sites use black-hat SEO tactics to get more search engine traffic. These black hat SEO techniques are disapproved of by the search engines, normally because they consider such methods misleading, and irrelevant to providing quality content to site visitors. These black hat SEO practices will actually provide short-term gains in terms of rankings, but if you are discovered utilizing these spam techniques on your Web site, you run the risk of being banned by search engines.

Hidden text is a text that visitor's can't see when they visit your webpage. Some webmasters will do this by adding keywords throughout their webpage without it interfering with what the visitors actually see. If you wanted to hide text, you would simply make the color of your text the same color of the background color. With this techniques many website want to rank well but they have the potential risk of getting banned by Google.