Clarifying what an ADT is

22 hours ago 4
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I'm a bit stuck on the concept of an ADT, what I know is that, and ADT is an idea (implemented through an Interface) that dictates how a program structures its data. But when implementing ADTs, we use other fundamental ADTs (arrays, sets, etc). The part that confuses me is what makes those fundamental ADTs objectively different to the ADTs we've implemented recently (Stacks, Queues). Any help would be great!

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