What is a function?

A function is indeed a reusable block of code that performs a specific task. Functions allow programmers to encapsulate code that can be called multiple times throughout a program, promoting efficiency and reducing redundancy. By defining a function, you can execute the same set of instructions by simply calling its name, which makes the code easier to read, maintain, and debug.

Using functions helps in organizing code into logical segments, making it easier to manage complex programs. Moreover, functions can take inputs, known as parameters, and can return outputs, further enhancing their versatility and utility in programming.

The other options refer to different programming concepts that do not align with the definition of a function. For example, a collection of variables does not perform tasks by itself but may serve as data holders. A type of conditional statement relates to making decisions in code flow but does not encapsulate executable tasks like a function. Lastly, a way to store data refers to data structures, which manage the organization and storage of data rather than providing reusable code blocks for specific tasks.