what happend when you pop vector code example

Example: c++ vector pop_back

#include <bits/stdc++.h> 
using namespace std;
int main(){
    vector<int> v1{10, 20, 30, 40, 50};
    
    //removing elemenets
    v1.pop_back();  //removes 50
    v1.pop_back();  //removes 40

}