a set of standards adopted by the moving pictures experts group for the compression of digital video and audio data or a file of data compressed according to those standards
"The movie downloaded from the streaming site was saved as an MPEG file, making it easy to store on my small hard drive."
Any of a group of computer file formats for the compression and storage of digital video and audio data.
"The old movie clip was saved in an mpeg format to make it take up less space on my hard drive."
In plain English: MPEG is a set of rules that lets computers and phones compress video files so they take up less space without losing too much quality.
"The movie downloaded in mpeg format played smoothly on his old TV."
Moving Pictures Experts Group
"The video file was compressed using standards developed by the Moving Pictures Experts Group to reduce its size without significant loss of quality."