Hard-and-fast rules are laws that are strictly enforced and not open to interpretation. They are usually set in place to ensure that everyone follows the same rules and regulations, and they are often used to protect people from harm or injustice. Laws are the most common type of hard-and-fast rule, as they are designed to be followed without exception. Other examples of hard-and-fast rules include workplace policies, school rules, and even family rules. These rules are meant to be followed without question and can have serious consequences if broken.