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Definition
MP3 (MPEG Audio Layer III) is the most widely recognized audio compression format. It uses lossy compression to reduce music files to about 10% of their original size while maintaining acceptable quality. MP3 revolutionized digital music distribution in the late 1990s.
MP3 was developed by the Fraunhofer Society and standardized in 1993. The codec uses psychoacoustic models to identify and discard audio information that is less perceptible to human hearing — sounds masked by louder sounds, frequencies at the edges of hearing range, and subtle details in complex passages. This allows dramatic file size reductions.
At 128 kbps, MP3 produces decent quality suitable for casual listening. At 192-256 kbps, quality is good enough for most listeners. At 320 kbps (the maximum standard bitrate), MP3 is nearly indistinguishable from CD quality for most content. The LAME encoder, an open-source MP3 encoder, is considered the best implementation for quality.
While MP3 remains ubiquitous due to universal device and software support, newer codecs like AAC, Opus, and Vorbis achieve better quality at the same bitrate. AAC at 128 kbps roughly matches MP3 at 160 kbps. Despite this, MP3's universal compatibility — every device, browser, and player supports it — keeps it relevant for maximum portability.