FLAC stands for Free Lossless Audio Codec. Grossly oversimplified, FLAC is similar to MP3, but lossless, meaning that audio is compressed in FLAC without any loss in quality.
Storm Codec can play RealMedia, QuickTime, MPEG-2, MPEG-4, AC3/DTS, ratDVD, VP3/VP6, Indeo, XVD, Theora, Subtitles, OGG/OGM, Matroska, APE, FLAC, TTA, AAC, MPC, Voxware, 3GP/AMR without any other Media Player.