Abstract data type

general
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1

Abstract is something that will not contain the implementation details.
Data type is something clasification of data based on the characteristics.
So i believe that abstract data type is something that creates new data types to the programmer with some of the impelementations. is my understaing about ADT is correct?

Then i saw some of the ADT like String ADT, Stack ADT, etc. Why they are calling this as an ADT.
Can be create ADT?

2

Is stack data type? For me data type is int, double, Person, Vertex. And Stack, Heap, Queue, List are data structures… I know, that in theory it’s not important, but what language are you interested in, it seems to me, that abstract data structure is interface if I understood you well…