What Does Three-Way Handshake Mean?
A three-way handshake is a method used in a TCP/IP network to create a connection between a local host/client and server.
Techopedia Explains Three-Way Handshake
A three-way handshake is primarily used to create a TCP socket connection to reliably transmit data between devices. For example, it supports communication between a web browser on the client side and a server every time a user navigates the Internet.