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Broadcast versus on demand.
Cable sends the sane data to everyone at the same time. So it is something like, read from the hard drive once. Send it out once. Everywhere it goes, it is just the same thing replicated to each and every reciever, no changes, just copy and paste.
Streaming is different. Every piece of information sent is basically unique, you need to send each piece of information perfectly, you need to read from the hard drive thousands of times, as everyone is watching something different, you need to send unique information to the right location perfectly and in order and at the right time. If it goes wrong, you get buffering.
Cable and Broadcast, no buffer ing, but no choice.
Streaming, choice but with buffering