IP (Internet Protocol)

Standard set of rules for formatting and transporting data across the Internet and other networks that use packetized datagrams for communication. These rules include a standard format for headers that appear on each packet and a mechanism for addressing packets so that they can be sent from a source to a destination. The standard that we call IP today was defined in RFC 791 in September 1981 for the Defense Advanced Research Projects Agency of the U.S. government; it is now part of the set of standards maintained by the IETF.