Why does a computer run a game poorly, but is able to show a video of it perfectly fine
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When you watch a video, all you are doing is looking at a series of still images in order accompanied by an audio recording.
To actually play the game, your computer must perform all of the computations and mathematics required to run the game and, more importantly, to draw all of the graphics, including lighting, particle effects, etc.
To put it in more ELI5 terms, imagine making a flipbook animation and then flipping through it. Now imagine that instead of drawing the flipbook ahead of time, someone else was telling you what all the characters should be doing and you had to draw it *as* it was being played back.
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