All MPEG standards exist to promote system interoperability among your computer, television and handheld video and audio devices. They are:
- MPEG-1: the original standard for encoding and decoding streaming video and audio files.
- MPEG-2: the standard for digital television, this compresses files for transmission of high-quality video.
- MPEG-4: the standard for compressing high-definition video into smaller-scale files that stream to computers, cell phones and PDAs (personal digital assistants).
- MPEG-21: also referred to as the Multimedia Framework. The standard that interprets what digital content to provide to which individual user so that media plays flawlessly under any language, machine or user conditions.