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Encyclopedia Britannica
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protocol

computer science
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protocol, incomputer science, a set of rules or procedures for transmitting data between electronic devices, such ascomputers. In order for computers to exchange information, there must be a preexisting agreement as to how the information will be structured and how each side will send and receive it. Without aprotocol, a transmitting computer, for example, could be sending its data in 8-bit packets while the receiving computer might expect the data in 16-bit packets.Protocols are established by international or industrywide organizations. Perhaps the most important computer protocol is OSI (Open Systems Interconnection), a set of guidelines forimplementing networking communications between computers. Among the most important sets ofInternet protocols areTCP/IP (Transmission Control Protocol/Internet Protocol),HTTPS (Secure HyperText Transmission Protocol), SMTP (Simple Mail Transfer Protocol), andDNS (Domain Name System).

The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated byErik Gregersen.

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