What is tcp/ip connection establishment?

[mountaing]

Wiki link to TCP - Transmission Control Protocol: https://en.wikipedia.org/wiki/Transmission_Control_Protocol

The great wiki explanation goes in greater depth about the three way TCP-handshake.

Before two computers can transfer data over a network a connection must be establish between them.

A three way handshake takes place to establish a connection, see the diagram below.

Note: TCP establishes connections and terminates them, UDP does not.