In computer programming, a collection is an abstract data type that is a grouping of items that can be used in a polymorphic way.
Often, the items are of the same data type such as int or string. Sometimes the items derive from a common type; even deriving from the most general type of a programming language such as object or variant.
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In computer science, a list or sequence is a collection of items that are finite in number and in a particular order. An instance of a list is a computer representation of the mathematical concept of a tuple or finite sequence.
A list may contain the same value more than once, and each occurrence is considered a distinct item.