Sounds, Music, and Video Clips on the Web
•RealNetworks, Inc., developed the RealAudio format for audio files and the RealVideo format for video files. 
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•You must download and install one of the real file players from the firm’s Web site to play these files.
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•The file extension for this format is .ra or .ram.
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•RealNetworks formats are compressed to further increase the efficiency with which they can be transferred over the Internet.