Explain what is the stack of autorelease pools. How autorelease pool work under the hood?
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Answer / Arpit Shukla
In Objective-C, Autorelease Pool is a runtime mechanism that manages memory allocation for objects. The stack of Autorelease Pools in iOS helps manage memory during the execution of an app's event loop.
1. When you create an object with `alloc` and set it to an autoreleased variable using `autorelease`, it is added to the current autorelease pool.
2. When the autorelease pool drains (usually at the end of an event loop iteration), the objects are sent a release message, which decreases their retain count by one.
3. If the retain count becomes zero, the object is deallocated and its memory is freed.
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