C++: What is the difference between std::stack and std::queue?

1// stack — last in, first out
2std::stack<int> s;
3s.push(1);
4s.push(2);
5s.top();  // 2 (last)
6
7// queue — first in, first out
8std::queue<int> q;
9q.push(1);
10q.push(2);
11q.front();  // 1 (first)