system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do gifs take so long to load compared to full videos?
gpt
A GIF stores every single image in the animation.

A video stores multiple "Key Frames" (usually every time there is a significant change in the video e.g: a new camera angle).

Inbetween these key frames the video stores information about how the image has changed relative to the one that came before it. (eg: these pixels have got darker, these pixels have got lighter etc.)

This means that many of the frames in a video (running at 25fps) will be very similar to the frame before it, and so the information about what has changed will not take up much space.

This means that they are quicker to download.

Feel free to ask if any of this doesn't make any sense!