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AIF — Audio Interchange File Format
AIF is the short extension of AIFF, Apple's uncompressed audio format: the same sound quality as WAV, used by Mac audio software and many sample libraries.
AIF and AIFF are the same format. Apple introduced it in 1988 for uncompressed PCM audio; Logic Pro, GarageBand, Pro Tools and most samplers read and write it, and it keeps metadata such as artist and loop points better than WAV.
Uncompressed audio is large, about 10 MB per minute in CD quality, and many phones and web players do not play AIF. That is why AIF files are usually converted to MP3 or AAC for listening, or to FLAC for a smaller lossless copy.