AFS Definition:  A RealAudio® file (.RM) is a compressed audio file that is great for internet streaming and downloading but not a good choice for archival purposes.  Because the audio is compressed, using a codec developed by Real Networks®, the size of the file is much smaller than a comparable wave file of the same length.  (Comparison Table)  AudioFile Solutions encodes RealAudio® files in a 8-32Kbps format for conference calls which keeps the size of the file low and manageable.