A function is a set of instructions or operations that can be executed repeatedly by calling the function in a program. Functions typically take input arguments, perform a set of actions on those arguments, and then return output, which can be either a single value or a collection of values. The main benefit of functions is that they allow code to be more modular and reusable, increasing efficiency and reducing the amount of duplicate code that needs to be written. Functions can also be used to abstract away complexity and improve readability, making it easier to understand and maintain code over time.
