• pointer
• References

pointer

pointers are variable that stores address of the other variables.

int i = 3;

// A pointer to variable i (or stores
// address of i)
int *ptr = &i;

// A reference (or alias) for i.
int &ref = i;

#include <iostream>
using namespace std;
int main() {
   int *ip;
   int arr[] = { 10, 34, 13, 76, 5, 46 };
   ip = arr;
   for (int x = 0; x < 6; x++) {
      cout << *ip << endl;
      ip++;
   }
   return 0;
}

References

A reference variable is an alias, that is, another name for an already existing variable.

int a=10;
int &p=a;  //it is correct
   but
int &p;
 p=a;    // it is incorrect as we should declare and initialize references at single step.