Which of the following is a key benefit of a function in programming?

A key benefit of using functions in programming is that they increase code reusability. When a function is defined, it encapsulates a set of instructions that can be executed multiple times throughout the program without needing to rewrite the same code again. This not only saves time and effort in coding but also makes it easier to maintain and update the code.

For instance, if a specific calculation needs to be performed in multiple places within a program, you can write it once inside a function, and then call that function whenever needed. This reduces redundancy and enhances the readability of the code, allowing other developers (or even the original coder at a later stage) to understand the program's structure more easily.

Furthermore, functions can accept parameters, allowing them to operate with different input values each time they are called, further expanding their reusability. This versatile approach is fundamental in programming practices, making functions an essential tool for efficient coding and development.