In the context of computer science, a node refers to a basic unit of a data structure, such as a linked list, tree, or graph. It is a data object that contains a value and one or more references to other nodes.

In the case of a linked list, a node typically contains a value and a pointer to the next node in the list. In a tree data structure, a node is a unit that contains a value and pointers to its child nodes. In a graph, a node is a vertex that represents a point in the graph and can be connected to other vertices (nodes) by edges.

Nodes are essential elements of various algorithms and data structures in computer science, and their efficient management and traversal are crucial for the performance of many applications.