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What is a Subroutine in Programming?

In the context of computer science and programming, a subroutine (often shortened to "sub") is a small piece of code that performs a specific task. It is a function that is defined within another function or program, and it can be called multiple times from different parts of the program.

In other words, a subroutine is a reusable block of code that performs a well-defined task, and it can be used in different places within a program without having to duplicate the same code. This makes programs more efficient and easier to maintain, as they can be broken down into smaller, more manageable pieces.

For example, a program might have a subroutine for calculating the area of a circle, another for printing a message to the screen, and another for reading input from the user. These subroutines can be called multiple times throughout the program as needed, without having to rewrite the same code over and over again.

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