A NetworkSocket is a software structure that enables communication between devices over a network. It acts as an endpoint for sending and receiving data, allowing applications to connect and exchange information. Network sockets can be used in various protocols, such as TCP (Transmission Control Protocol) and UDP (User Datagram Protocol), each serving different purposes in data transmission. When a program wants to communicate, it creates a NetworkSocket and binds it to a specific IP address and port number. This binding allows the socket to listen for incoming connections or send data to other sockets. NetworkSockets are essential for enabling services like web browsing, email, and file sharing.