What is the difference between a macro and a const in C++?

Question

I was asked this question in a technical interview:

What is the difference between a const and a macro in C++?

My a

Answer 1

A macro always have a type, for instance, #define FIVE 5 is of type int.

An advantage for the const variable over the macro could be the memory usage : With a macro the value may have to be duplicated everywhere it is used will a const variable will not be duplicated in memory. (but I am not sure of this difference)