Question

what is difference between pointer *p and variable p

Answer 1

#include <iostream>
using namespace std;

int main(){
    int Apple = 25;
    int *Pointer = &Apple;
    
    cout<<Apple<<endl;
    cout<<Pointer<<endl;
    cout<<*Pointer<<endl;
    
    return 0;
}
 

---

Output:
25
0x7ffc39e1726c
25
 

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* before a variable's name gets the value of that variable.
That is if it is defined as a pointer.

Answer 2

Pointer is "special" variable that stores "address" in the memory, this address can be another variable address, if so, you can access it's value by using operator '*'