Final answer:
The use of functions in code improves modular design, enhances reusability, and simplifies maintenance by breaking tasks into manageable and self-contained units that can be called multiple times within the program.
Step-by-step explanation:
Using a function in code generally improves readability, maintainability, and reusability. Functions allow for modular design where different tasks are broken into self-contained units of code. Instead of having a long script performing all operations, employing functions breaks the process down into manageable chunks.
This modular design enables easier debugging since each function can be tested individually. It enhances code reusability because the same function can be called multiple times from different parts of the program or even in different programs without re-writing the code. Additionally, if a change needs to be made, it can be done within the function impacting all parts of the code that utilize the function - this greatly simplifies maintenance.