A Node is a fundamental unit in various fields, including computer science and networking. In computer networks, a node can refer to any device that is connected to the network, such as a computer, printer, or router. Each node can send, receive, or forward data, making it essential for communication within the network. In the context of data structures, a node is a basic building block used to create linked lists, trees, and graphs. Each node typically contains data and references (or pointers) to other nodes, allowing for efficient organization and retrieval of information. This structure is crucial for algorithms and data management in programming languages like Java and Python.