What programming concept involves placing one function within another?

Nesting refers to the technique of placing one function inside another function. This allows the inner function to leverage variables and functionality from the outer function, creating a structure where the inner function can operate effectively within the context of the outer function. Nesting is commonly used to organize code, enable encapsulation, and manage scope in programming.

In programming, when functions are nested, the inner function can access variables defined in the outer function, which can be particularly useful for creating closures. This concept is prevalent in various programming languages and can enhance modularity and readability by keeping related functionality grouped together.

Understanding nesting is critical for grasping more complex programming frameworks, as it leads to the development of more advanced programming techniques and designs. Concepts like recursion, iteration, and abstraction, while essential, focus on different aspects of programming; recursion involves a function calling itself, iteration refers to repeating a block of code, and abstraction is about simplifying complex systems into manageable parts without showing the underlying details.