There are many good compression techniques out there, that are able to sufficiently reduce the size of an audio file, while at the same time maintain optimum levels of audio quality. So while we have managed to obtain the ability of packaging thousands and thousands of songs into our miniature music players, we have had to sacrifice at least some amount of audio quality, owing to the compression methods that are used to achieve the size reduction of these audio files. In order to obtain a thing, something of equal value must be lost. However, at high enough bit-rates, they are both nearly indistinguishable from the original source and compared to the loss-less formats, and take up only a tiny amount of space on music players. AAC and MP3 fall under the category of ‘lossy’ audio formats, as in both of them, certain amount of original audio data is lost during compression.
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