Description: A nested function is a function defined within another function. This concept is fundamental in programming as it allows encapsulating logic and creating functions that are only relevant in the context of the outer function. Nested functions can access the variables of the containing function, facilitating the creation of more modular and readable code. Additionally, they promote code reuse by allowing the definition of specific behaviors that can be used in different parts of the outer function without exposing them to the global scope. This feature is particularly useful in programming languages that support the concept of closures, where the inner function can remember the environment in which it was created, even after the outer function has finished executing. Nested functions are a powerful tool for organizing code, reducing complexity, and improving maintainability, making them a common practice in modern programming languages.
