Functions in C are widely used to simplify code and improve modularity. They allow repetitive tasks to be executed without rewriting code, making the program more efficient and easier to maintain. Functions help in organizing code logically by dividing it into smaller, manageable blocks. They are crucial for code reusability, enabling the same code to be used in multiple places. Additionally, functions aid in debugging and testing, as each function can be tested independently.
For more details, check out the full article here.