UPDATED JUNE 2017 Watching online movie without downloading is called movie streaming. How this work? When you watch movie streaming you don�t have to wait downloading a file to play it. Instead of this, movie is sent in a continuous stream of data and is played as it arrives. So if you still hesitate about watching movies on stream, here is some most common benefits and minuses: First most obvious thing is that you save time on downloading, other good advantage is instantness, you just have to decide what movie you will watch and click on play, one of bigger minuses in past was quality of video, but now streaming is on good way to equalize with downloading, and more sites now is offering even HD quality streams. Second disadvantage can be internet speed, for HD movies needed to have more than 1 Mbps and sometimes up to more than 3 Mbps, but still you can watch movies in slightly lower quality without any problems.
