A basic unit used to build data structures such as linked lists, trees, and graphs.

"Each node in a linked list contains data and a reference (or link) to the next node in the sequence."

In network terms, a node is any physical device within a network of other tools that's able to send, receive, or forward information. In computing, it often refers to a basic unit used to build data structures such as linked lists and tree structures.

"Each node in a network can act as a redistribution point or a communication endpoint."