Streaming means that the video is played as the data is received, rather than loading the entire file and then playing it back.
Streaming only works properly if there is sufficient bandwidth – if it takes 10 seconds to download 8 seconds worth of video, the playback will have to keep pausing to wait for more data.
Therefore, it’s possible that if a site offers the option of streaming or downloading, the download may be in a higher quality (and therefore require more bandwidth to download) than the file that is streamed since it doesn’t have to be played back in real time. But if the data that is sent is the same, it doesn’t take less bandwidth to stream.
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