Answer
Microtasks: Executed immediately after current execution stack (Promises, queueMicrotask).
Macrotasks: Executed in next event loop turn (setTimeout, setInterval, I/O).
Crucial for understanding async flow and ordering.
Quick Answer
Microtasks (Promise .then, queueMicrotask): processed immediately after current synchronous code, before any macrotask. Macrotasks (setTimeout, setInterval, I/O events): processed one per event loop tick. All microtasks drain completely before the next macrotask runs. This means a long chain of Promise resolutions can delay a setTimeout(fn, 0) callback.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ