What is a FLAC file?
FLAC (Free Lossless Audio Codec File) is one of the most popular lossless audio formats that can retain the overall quality of your music. It is an open-source format, which is owned by the Xiph.Org Foundation. You can open FLAC files on VLC, Groove, MPlayer, Windows Media Player, and so on.
What is an M4A file?
M4A, which stands for MPEG-4, is a lossy file format that is used to store and transfer audio data. It follows the Advanced Audio Coding (AAC) scheme while compressing audio data. When you download music from the iTunes Store, the files are mostly stored in the M4A format.