FLAC (Free Lossless Audio Codec) is an audio coding format for lossless compression of digital audio. Unlike lossy audio formats such as MP3, AAC, and Vorbis, FLAC does not discard any audio information, so it is well-suited for archiving audio collections. An audio file encoded to FLAC can be decompressed into an identical copy of the original audio data. FLAC reduces audio file size by 30-70% without any loss of quality. It supports metadata tagging, album cover art, and fast seeking. FLAC is an open format with royalty-free licensing and a reference implementation is available under the GNU General Public License. It is widely supported by audio playback software and hardware devices. FLAC is often used for distributing high-resolution audio files, such as those ripped from CDs or downloaded from online music stores that offer lossless audio. It is also a popular choice for audiophiles who want to preserve the original quality of their music.