Returning values?

Question

Programming

What does it mean to return values?

For example, there is a function with void and it does not return a value, but in the body of the function there are operators that return something ... How to understand this?
The same alert in JS, for example, does not return a value, but it also outputs a string to the browser...

My brain with 0.001 iq does not want to understand... Please explain

Answer 1

The return value is a write to a special area of ​​memory at the end of the function. There are functions that work with pointers - they immediately write data to the memory area assigned to the variable. Such functions can be void.