One-Off Timers with setTimeout

setTimeout(callback, delay);

Where callback is a function and delay is the number of milliseconds until the callback is invoked.

Repeat Timers with setInterval

setInterval(callback, delay);

Where callback is a function and delay is the number of milliseconds between each invocation.

NOTE:
setTimeout and setInterval don’t invoke the callback immediately. So, you have to invoke the callback yourself first manually if you want it to run immediately.

Cancel a Timer

Canceling timeouts

const timeoutID = setTimeout(callback, delay);
clearTimeout(timeoutID); //Clears the timeout immediately

Canceling intervals

const intervalID = setInterval(callback, delay);
clearInterval(intervalID); //Clears the interval immediately