What is the difference between microtasks and macrotasks?
PICTURE THIS: DOM IS A TREE
Simple meaning
Microtasks include Promise callbacks and queueMicrotask and they flush completely before the next macrotask.
WHY — JavaScript instead of guessing?
Why interviewers care about JavaScript:
contrast on JavaScript, not two memorised paragraphs.
the developer, then one case where picking wrong hurts.
Name the idea, why it exists, then one short example.
End with when you use it and one common pitfall.
STEPS — What happens step by step?
Before you speak the answer, walk the interviewer through these steps:
- 1Microtasks include Promise callbacks
and queueMicrotask and they flush completely before the next macrotask.
- 2Macrotasks include setTimeout, setInterval,
and many DOM events.
- 3Starving the queue with
an infinite Promise chain can freeze rendering, which I mention as a gotcha.
- 4Give an example
One tiny concrete case you can say aloud.
- 5Common mistake
What juniors usually get wrong.
- 6Close
When you pick this over the alternative.
EXAMPLE — See it in action
Here's a short line you can speak, broken into clear beats:
Note: Adapt this scaffold to your own project — keep it under 60–90 seconds.
Key takeaway
Microtasks include Promise callbacks and queueMicrotask and they flush completely before the next macrotask. Macrotasks include setTimeout, setInterval, and many DOM events.