mpeg (or . mpg) file extension is an MPEG video file format, which is a popular format for movies that are distributed on the internet. They use a specific type of compression that makes streaming and downloading much quicker than other popular video formats.
The Moving Picture Experts Group is a working group of authorities that was formed by ISO and IEC to set standards for audio and video compression and transmission. It was established in 1988 by the initiative of Hiroshi Yasuda and Leonardo Chiariglione, group Chair since its inception.