The MPEG compression standard was developed by Moving Picture Experts Group. There are four varieties of the format - MPEG-1, MPEG-2, MPEG-3, and MPEG-4, which have improved compression and coding algorithms. This technology defines the compression standards for both audio and video information and makes it convenient for transmission in the broadcast. The MPEG encoding process removes redundant video data in a series of adjacent frames. Typically, MPEG media files have the .mpg extension.