Why vectors?

Question

What are they used for?

Answer 1

#include <iostream>
#include <vector>
using namespace std;

int main() {
vector<int> a;
a.push_back(5);
a.push_back(3);
a.push_back(7);
for(int i=0; i<a.size();i++){
cout<<a[i]<<endl;
}
return 0;
}

Answer 2

arrays is a type of static data structure and vector is a dynamic data structure.

Answer 3

vectors are like arrays, but vectors can grow dinamically to allocate new elements, when needed to.