For instance, what would sound like silence to a human being in WAV, and yet takes up space, takes up no space in MP3. The various size-reducing methods, such as MP2 or MP3, rely on removing the storage burden of sounds that occur outside the audible range. For example, uncompressed audio, also known as a WAV file, can crunch down to a fraction of its original size. Raw audio and video files can occupy a tremendous amount of space. Putting this in perspective: in one minute of film, there are around 1,800 pictures! The average film contains about 30 pictures-per-second of footage. A movie on film is made up out of a lot of still images.
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