MP4 and GIF explained
MP4 is a container, not a codec. It usually holds H.264 video and AAC audio, and that specific combination is the closest thing the internet has to a universal video format.
GIF is a 1987 format limited to a 256-colour palette per frame, with support for simple animation and one fully transparent colour. Its longevity is cultural rather than technical — nothing about it is efficient by modern standards.
- Where MP4 files come from
- Phone cameras, screen recorders, and every video streaming platform.
- Where GIF is used
- Reaction images, simple UI animations, and screen recordings shared in chat.