FLAC (Free Lossless Audio Codec) is an open-source, lossless audio format. It is a popular format for high-quality digital audio files because it provides high-quality audio while maintaining a relatively small file size. Unlike lossy audio formats such as MP3 or AAC, FLAC is a lossless format, meaning that it compresses audio data without losing any information. This results in audio files that are of higher quality than those compressed using lossy formats. FLAC supports metadata, such as artist and album information, and it also supports multichannel audio, high-resolution audio, and embedded cover art. FLAC files are compatible with a wide range of audio software and hardware, including most media players and digital audio workstations.