A Port is an unsigned integer that uniquely identifies a process running over a network for the purpose of providing a service. A socket is the end point of a two way communication between two processes running over a network. Microsoft .NET provides excellent support for writing programs that leverage the power of Sockets to implement programs that can run over a network to communicate and share data and information. In this article we have had a look at how we can work with Sockets using Microsoft .NET and how we can implement a simple client-server program that can communicate over a network. Reader's comments and suggestions are welcome. Happy reading!