For example, a 4-minute song, of 40MB size in uncompressed WAV format, when converted to mp3 the corresponding file has a size up to 11 times smaller, with an average quality of 128Kbps. When compressing, some sound signals are removed from the file, which is practically indistinguishable by the human ear, as well as those that can be played only on high-quality equipment. The MP3 format uses a lossy audio compression algorithm. The format was first published in 1991 but only gained popularity in the early 00s along with the growing popularity of internet use. MP3 (MPEG-1 audio layer 3) is the most popular audio encoding method.
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