Why point to a memory cell for the last element in an array or vector?

Question

Suppose we have an array named datasize 5. If we pass this array as an argument to a function std::end, for example

int *ptr = std::end(data);

It will return a pointer pointing to the memory location for the last element in the array.

Question

What is the point of pointing to a pointer to a memory cell for the last element in an array? Why not just point to the last element of the array?

Answer 1

To specify an "empty" container / sequence of one with elements in it.

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