The whole picture is sent to you all at once, which is why you see the whole picture instead of just half of it. So you can just save it…because your web browser *already has it*.
The whole video is not sent to you all at once. A few seconds at a time are steadily sent to you on a constant basis – that’s what “streaming” means. Your web browser cannot just save the video all at once because it doesn’t have the whole video all at once.
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