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Joint Photographic Experts Group (JPEG) - JPEG File Interchange Format (JFIF)

JPEG/JFIF is not a protocol, but:

JPEG / JFIF is good to use for photos, but should be avoided for diagrams, icons and alike (with hard edges and only a few colors).

Obsoleted by the ["PNG"] graphics file format, but still widely used.

JPEG isn't obsoleted by PNG. They serve different purposes and PNG doesn't come near the compression that JPEG is capable of with a small loss in image quality.

Before PNG, GIF was the recommendation for diagrams, icons and such. GIF has been obsoleted by PNG for everything, except animations, which PNG doesn't support.