MPEG-21

<compression, standard, algorithm, file format> A file format designed to merge very different things in one object, so you can store interactive material in this format (audio, video, questions, answers, overlays, non-linear order, calculation from user inputs, etc.)

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MPEG-1 MPEG-1 audio layer 1 MPEG-1 audio layer 3 MPEG-1 layer 3 MPEG-2		MPEG-2.5 audio layer 3 MPEG-2 AAC Low Profile MPEG-2 audio layer 3 MPEG-2 Low Sampling Frequencies Extention MPEG-2 LSF