In computer science, a list or sequence is an abstract data type that represents a countable number of ordered values, where the same value may occur more than once. An instance of a list is a computer representation of the mathematical concept of a finite sequence; the (potentially) infinite analog of a list is a stream.

Lists are a basic example of containers, as they contain other values. If the same value occurs multiple times, each occurrence is considered a distinct item.

A singly linked list structure, implementing a list with 3 integer elements.

The name list is also used for several concrete data structures that can be used to implement abstract lists, especially linked lists.