mpeg;

Moving Picture Experts Group;

MPEG is any of a group of file formats that compresses video and audio data. Evidently, these file formats are used for videos or audios. MPEG provides a standard image of 352x240 dots per inch, 30 frames per second, 15-bit color. The file size of MPEG file formats vary according to number of bits in that file (duration of the video/audio).
MPEG groups of standard include: MPEG-1 - 7, etc.