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Definition: bitstream

(1) A series of bits. It typically refers to the transmission of data but may refer to that same set of data in memory or in storage. A bitstream may be structured in any number of formats, but the term is used at the hardware level when referring to the actual flow of data or a block of data in storage.

Bytestreams and Octet Streams
A stream of bytes, also called "octets," is a "bytestream" or "octet stream" and is naturally also a bitstream because bytes are made of eight bits.

Application/Octet Stream
An "application/octet stream" refers to bytes flowing over the Internet. See byte and octet.

(2) An audio mode on DVD and Blu-ray players. See Bitstream mode.