- adjective used to describe data transfer that occurs according to a series of fixed, pre-defined steps that will create a known and reliable path between the two devices. For example TCP/IP is a connection-oriented protocol that uses a known modem or network adapter to contact another known computer and establish a link via TCP/IP commands.
- A mode of communication in which a direct and dedicated connection between two nodes must be established before transmission and reception can occur. Once the transmission is concluded, the connection is terminated. ATM and regular telephone connections are of this nature. This contrasts with connectionless.