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In computer science, an abstract data type is a theoretical data type that is largely defined by the operations and work on it and the limitations that apply. Professionals describe an abstract data type as a “mathematical model” for groups of data types, or as a “value with associated operations” that is independent of a particular implementation.
When talking about abstract data types, it is helpful to have a knowledge of more concrete data types that are defined more clearly. By contrast, abstract data types are supposed to be broader definitions. For example, an exploration of abstract data types in Java often includes the “List” data type, which can be open to various implementations. IT experts might also use the idea of a “real life” example where a more abstract identifier like “car” represents the abstract data type, and a narrower, more precise identifier like “Nissan Altima” represents a defined or concrete data type.