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RealNetworks is a Seattle-based provider of Internet media delivery software and services. The company is best known for the creation of RealAudio, a compressed audio format, and RealVideo, a compressed video format, and for its early market leadership in the field of streaming media.

RealMedia audio streaming files can contain RealAudio and RealVideo streams, and possibly several other formats like SMIL.


RealNetworks (then known as Progressive Networks) was founded by ex-Microsoft executive Rob Glaser in 1993. The original goal of the company was to provide a distribution channel for politically progressive content. It quickly evolved into a technology venture to leverage the Internet as an alternative distribution medium for audio broadcasts.

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