JavaScript Timers

setTimeout: Run Once

setTimeout(() => {
  console.log('Delayed');
}, 1000);

Runs code after delay.

setInterval: Run Repeatedly

const interval = setInterval(() => {
  console.log('Every second');
}, 1000);

clearInterval(interval); // Stop

Key Takeaway

setTimeout runs once. setInterval runs repeatedly. Clear with clearTimeout/clearInterval. Essential for delayed execution.