Exploitation movie is a label that is applied to certain movies: These usually have a low budget, and focus on showing either violence or sex. Very often, they try to be successful by following a trend. Sometimes they are produced for a niche of the market. In almost all cases, exploitation movies fall in the category B-movies. Sometimes, exploitation movies attract a cult following they get the attention of the movie critics. Some of these movies set trends, and become important. An example of such a movie is Night of the Living Dead, of 1968. 