What are subroutines in pseudocode?

The concept of subroutines in pseudocode refers to blocks of code that represent unique tasks, which are specifically organized to be reusable within a larger program. This means that when a subroutine is defined, it can encapsulate a particular function or a set of instructions that can be invoked whenever that task needs to be executed again, rather than rewriting the same code multiple times throughout the program.

By utilizing subroutines, programmers can enhance the structure and readability of their code, as well as streamline the debugging process. Each subroutine can be designed to perform its task independently while still interacting with the main program, promoting modular programming.

The other options do not accurately capture the definition of subroutines. While some blocks of code might repeat tasks, that repetition is addressed through the mechanism of subroutines, which is not what's meant by duplicate tasks defined separately. Sections of code that loop indefinitely characterize a different aspect of programming related to control flow, and variables for user input pertain to data storage and manipulation rather than being a code block aimed at performing defined actions.