Infinite

An infinite loop is one that doesn't know when to stop; it loops forever.

while (true) {
  // ... code to execute over and over
}

Why? What are the uses?

If a program presents a menu, you choose an option, and then you are presented with the menu again, you are using an infinite loop.
The loop will continue until you break out of it by entering the "quit" option.

Since an infinite loop will make your program run forever, there has to be a way to get out of the loop.

If a program has an infinite loop with no way of exiting the loop, any code after the loop is considered unreachable.

Unreachable code is code that has no way of executing.

Unreachable code causes a compiler error.

while (true) {
  // ... code to execute forever
}
int x = 0; // WILL NOT COMPILE, Unreachable code.