RealMedia

RealMedia is the multimedia container that was originally created by RealNetworks to house its RealVideo and RealAudio formats. The extension for RealMedia is .rm and is normally used for streaming content online.

Streams using .RM are typically CBR, constant Bitrate transfers although Real has developed rmvb intended to house VBR streams.

RM is a competitor for streaming with FLV and Quicktime.