Streaming is a process that lets you watch a film without having to download the file. The file is read instantaneously. You don’t need to download P2P or Peer to Peer software to enable you to share files. In practical terms, you connect to a streaming website like You Tube, DailyMotion, or Vimeo, you click on a video and it starts to download. You don’t have to wait for it to finish downloading to start watching the film. Streaming is based on buffering, which saves some of the file data of the film just before you start to view it, so as not to interrupt the reading.
For music, Deezer is a website that lets you listen to high quality pieces free of charge. For films, if you want to watch a film via streaming, enter the title in Google, followed by "streaming", and you should find it easily.