Real Media Audio files are indicated by the extension RAM.
These represent a special variant of the Real-Media-Container, which uses the extension rm.
The container format developed by RealNetworks typically includes video and audio sources encoded with the proprietary, lossy Real Video or Real Audio compression technology.
RAM files contain only audio streams that are encoded using the RealAudio method.
RealMedia is primarily used for streamed content, as it allows you to create and send different quality levels of a source material simultaneously. It is especially common in Asia.