can someone explain me what are ADT(abstract data types)

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Abstract data types are specific types of data that are abstracted.

The most important part of these types is that they're abstracted types of data.

Hope this helps.

Are you sure, that "ADT" does not mean "algebraic data types"? They are way more interesting...

Because abstract data types are basically just declarations of some properties an implementing type would exhibit. An example are fully abstract classes and interfaces in OOP.