Movies that have been put on a website and are played using an online video player are known as Streaming Movies. To stream a movie is illegal but many well-known sites do it regardless. The movies are put on private servers and are then made public. This in no way is profitable to the creators of the movie, but is very profitable to the website that is hosting the movie, because it increases traffic. Options to watch movies online come in a variety of formats and size ranging from AVI quality, the best quality an online video can have, Mp4 quality only second to the AVI. FLV is the most common of the formats used by many sites such as YouTube because of its smaller size considerable better quality than that of mobile devices format or other minor formats such as 3Gp. Many Streaming Movies are almost always available in different formats for the viewer, and it depends on the connection of the viewer that what they watch. Streaming Movies sites are periodically updated as soon as another version or format of a movie is available.