what does it means?

Question

int a;
int b;
int sum;
cout << "enter a number \n";
cin >> a;
cout << "enter another number \n";
cin >> b;
sum=a+b;
cout << "sum is:" << sum << endl;

WHY"<< endl"???

Answer 1

endl is used similarly to \n except that it clears the output buffer whereas \n does not.

Answer 2

what is an output buffer