Their use seems elementary but ask any well-seasoned programmer and they too use them. It allows you to understand complex functions or to explain the operation you’re going to do or just about what ever you would want to include in your programs as long as they are treated as comments. They also make great tools when troubleshooting/debugging programs for sometimes, the long days and nights do translate into a lot of code, some of which look almost all the same. Ruby reminds me of a documentation program we had included with previous programming languages such as C and even Cobol which has an add-on or function with the compiler which dissects the program and documents everything.