What is a 'function' in programming?

A 'function' in programming refers to a block of code designed to perform a specific task. It allows programmers to encapsulate code that can be reused throughout their programs, which enhances modularity and maintainability. By defining a function, you create a self-contained piece of code that can be called multiple times with different inputs, enabling you to avoid redundancy and streamline your code.

Functions often take inputs, known as parameters, and can return outputs based on the operations performed within the block of code. This structure is fundamental in programming as it promotes code organization, makes debugging easier, and allows for more straightforward collaboration among programmers. By enabling a clear definition of tasks and separating them from the main logic of a program, functions contribute significantly to effective coding practices.