Dramatically smaller size on disk. Video codecs leverage representing things using diffs. Think about a 2 minute video of someone reading an article online. The

Dramatically smaller size on disk. Video codecs leverage representing things using diffs. Think about a 2 minute video of someone reading an article online. Then think of 60 screenshots of someone reading that article over 2 minutes. The 60 screenshots are likely ~15-30MB. The video is probably like 3MB or less and that’s without doing much of anything. Any time the user is idle, that’s kind of free in a video. An image, it wouldn’t be.