What's the difference between arrays of arrays and multidimensional arrays?

Question

I had a language-agnostic discussion with someone in the C++ chat and he said that arrays of arrays and multidimensional arrays are two things.

But from what I lear

Answer 1

I would expect multidimensional arrays to offer operations such as "Give me the number of dimensions" or "Give me a certain column" or "Give me a certain sub-view". C arrays don't offer these operations.