How do functions and subroutines help programmers avoid repeating code?

Functions and subroutines, also known as subprograms or procedures, help programmers avoid repeating code by allowing a specific set of instructions to be defined once and reused multiple times throughout a program.1

Think of a subprogram like a sauce recipe: once it is written, it can be called upon as part of many different larger recipes whenever that specific task is needed. By encapsulating logic—such as a calculation or a complex operation—into a named function, a programmer can simply "call" that name rather than rewriting the same lines of code in every location where the operation is required.1

This approach offers several key benefits:
* Modularity: It breaks complex problems into smaller, more manageable subproblems.1
* Efficiency: It reduces redundancy, as common tasks are stored in a single location or library.1
* Maintainability: If the logic within the function needs to be updated, the programmer only needs to change it in one place rather than hunting down every instance where the code was manually repeated.1