MPEG-4 is a standard that is mainly used for compressing video and audio files that was introduced in 1988. MPEG stands for the Moving Picture Experts Group, which is designated for setting standards for video and audio coding. MPEG-4 is different from MPEG-1 and MPEG-2 because it includes new features. For example, extended VRML support for 3D rendering has been added as well as object-oriented composite files, externally-specified Digital Rights Management support, and others. These benefits increase the quality of digital television, animated graphics, World Wide Web, and others.
MPEG-4 also helps fight against copyright violation. Just as an example, iTunes uses this standard which makes file sharing harder. You may notice this if you are trying to share something you bought from iTunes with your friend and get very frustrated (I know I have).
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