Final answer:
The correct practice in programming for describing what functions do is to document them through comments. This leads to more maintainable and understandable code, which is beneficial for individual developers and teams alike.
Step-by-step explanation:
It is good programming practice to document your functions by writing comments that describe what they do. Documenting your code helps to clarify the purpose and functionality of functions to anyone who reads the code in the future, which includes yourself. Comments should provide a high-level overview of the logic, parameters expected, return values, and any side effects or exceptions that a function might have.
By documenting your functions, you also ensure that your codebase is maintainable and easier to understand. This practice is essential for collaboration with other developers as well. A well-documented codebase is a hallmark of a professional and well-structured software project.