What is the difference between setTimeout() and setInterval() in JavaScript?

setTimeout(function,duration) - This function calls the function after duration milliseconds. This works for one execution. Let's see an example -

It waits for 2000 milliseconds and then runs the callback function alert('Hello') -

setTimeout(function() { alert('Hello');}, 2000);

setInterval(function,uration) - this function Calls the function after every duration milliseconds. This can be done an unlimited number of times. Let's see an example -

It triggers an alert ('Hello') every 2000 milliseconds, not just once.

setInterval(function() { alert('Hello');}, 2000);

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