What is Socket Programming Socket Programming is becoming more and more popular among programmers. Socket provides the communication mechanism between two computers using TCP. When the connection is made, the server creates a socket object on the end of the communication. The client and the server can now communicate by writing to and reading from the socket. The java.net.Socket class represents a socket, and the java.net.ServerSocket class provides a mechanism for the server program to listen for clients and establish connections with them. ServerSocket Class Methods The java.net.ServerSocket class is used by server applications to obtain a port and listen to the client’s request. Socket Class Methods The java.net.Socket class represents the socket that both the client and the server use to communicate with each other. The client obtains a Socket object by instantiating one, whereas the server obtains a Socket object from the return value of the accept() method.