User message and delimiter

Can someone clarify why do we use delimiter with user message? What is the need to delimit user message?

To provide clear and concise prompt to model.u can also go without delimeter also.
OpenAI API check this out

To break a large text into several lines while maintaining line continuation helps improve readability in a fixed-size Jupyter cell.

Thank you very much. In this course, most of the user messages are straight forward, so I guess delimiters are shown to demonstrate the best practises perspective.