JPEG,MPEG
Very similar. JPEG was intended for stills and MPEG for movies. JPEG can
and is being used for movies and in some ways is better, because it
retains individual frame information and can be edited very readily. MPEG
is better as a playback system than an editing system. MPEG is really an
umbrella standard. Within it is MPEG-1 (which most desktops use) and the
still-in-the-works MPEG-2, meant for the higher end, like digital
broadcasts.
The acronyms stand (as I dimly recall) for Joint Photo Experts Group and
Movie Photo Experts Group, the industry teams developing the standards.