Explain closures in JavaScript.

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A closure in JavaScript is a feature that allows a function to "remember" and access variables from the scope in which it was created, even after that scope has finished executing.

Key Points about Closures:

1. Definition
   A closure is formed when an inner function "closes over" variables from its outer function's scope.

2. Access to Outer Variables
   The inner function can still use those variables, even if the outer function has already completed execution.

3. Preserves State
   Closures let you maintain and manipulate a "private" state. They’re often used to keep certain data hidden and safe from external access.

4. Common Uses

   • Data privacy / encapsulation (creating private variables).

   • Callbacks and event handlers (functions remember the context they were created in).

   • Function factories (functions returning other customized functions).

   • Asynchronous programming (like in setTimeout, promises, etc.).

5. How it Works Conceptually

   • When a function is created, it carries with it a reference to its surrounding scope (called the lexical environment).

   • This environment persists as long as the inner function exists, allowing access to those outer variables later.

✨ In simple words:
A closure is a function bundled with its surrounding state. It allows the function to continue accessing variables that were in scope when it was first defined.

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