45 - Rule is " : a generalization of an observed regularity. It overlaps with formula, theorem, principle, proposition, law, statement, and more." (Wozniak 2020).
You use rules to get a desired outcome because they point you towards an “action → outcome” relationship that repeats. So you can rely on the rule when you make decisions or act in the world.
When you combine a set of rules you create a model, which allows you to work with a multifaceted phenomenon. See 10e1 - Food Rules.