Stack Memory

• primitive type

• string| number| boolean| null| undefined | Symbol | BigInt

Head Memory

• reference

• Arrays |Function | Objects

Macro task

• is a collection of distinct and independent tasks.
• setTimeout, setImmediate, requestAnimationFrame, setInterval, requestAnimationFrame, etc

Micro task

• are minor tasks that update the state of an application and should be completed before the browser moves on to other activities, such as re-rendering the user interface
• process.nextTick, Promises, queueMicrotask, MutationObserver