Standards for the way in which data is transmitted within a network, for example: TCP and IP.
Rules that allow communications hardware and software to communicate. Interoperability is a major concern when disparate systems attempt to communicate; both sides must understand the same protocol for the communication to be successful. A communications protocol defines: Rate of transmission in bits per second Whether the transmission is to be synchronous or asynchronous Whether the data is to be transmitted in half-duplex mode (data can only be transmitted in one direction at at time) or full-duplex mode (data can be transmitted in both directions at once) Rules for detecting and recovering from transmission errors Rules for encoding and decoding data (data compression and decompression)
A set of rules or standards designed to enable computers to connect with each other and exchange data. An example of a communications protocol is Point-to-Point protocol.