MP3 compression works by reducing (or approximating) the accuracy of certain components of sound that are considered (by psychoacoustic analysis) to be beyond the hearing capabilities of most humans.
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With the advent of portable media players, a product category also including smartphones, MP3 support remains near-universal.
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The MP3 format soon became associated with controversies surrounding copyright infringement, music piracy, and the file ripping/ sharing services MP3.com and Napster, among others. The combination of small size and acceptable fidelity led to a boom in the distribution of music over the Internet in the mid- to late-1990s, with MP3 serving as an enabling technology at a time when bandwidth and storage were still at a premium. This allows a large reduction in file sizes when compared to uncompressed audio. With regard to audio compression (the aspect of the standard most apparent to end-users, and for which it is best known), MP3 uses lossy data-compression to encode data using inexact approximations and the partial discarding of data. MP3 (or mp3) as a file format commonly designates files containing an elementary stream of MPEG-1 Audio or MPEG-2 Audio encoded data, without other complexities of the MP3 standard.
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A third version, known as MPEG 2.5 - extended to better support lower bit rates - is commonly implemented, but is not a recognized standard. Originally defined as the third audio format of the MPEG-1 standard, it was retained and further extended - defining additional bit-rates and support for more audio channels - as the third audio format of the subsequent MPEG-2 standard.
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MP3 (formally MPEG-1 Audio Layer III or MPEG-2 Audio Layer III) is a coding format for digital audio developed largely by the Fraunhofer Society in Germany, with support from other digital scientists in the United States and elsewhere.