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Connection-oriented communication
Implies that a connection is established, and a dialog between the programs will follow. The program that provides the service (the server program) establishes the connection. It assigns itself a name that identifies where to obtain that service. The client of the service (the client program) must request the service of the server program. The client does this by connecting to the distinct name that the server program has designated. It is similar to dialing a telephone number (an identifier) and making a connection with another party that is offering a service (for example, a plumber). When the receiver of the call (the server) answers the telephone, the connection is established. The plumber verifies that you have reached the correct party, and the connection remains active as long as both parties require it.
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