Collections
What is Collections?
In computer science, a collection is a grouping of some variable number of data items (possibly zero) that have some shared significance and need to be operated upon together in some controlled fashion. Generally, data items are of the same data type or, in object-oriented programming, based on the same class. Different kinds of collections exist and offer different properties in regard to data item ordering, indexing, performance characteristics, and more. Common examples include lists, sets, maps/dictionaries, trees, and graphs. Collections are fundamental data structures used in virtually all programming paradigms to efficiently store, retrieve, and manipulate groups of objects.
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