• Classification rules represent knowledge in the form of logical if-else statements that assign a class to unlabeled examples.• They are specified in terms of an antecedent and a consequent; these form a hypothesis stating that "if thishappens, then that happens."• The antecedent comprises certain combinations of featurevalues, while the consequent specifies the class value to assign when the rule's conditions are met.• Unlike a tree, which must be applied from top-to-bottom through a series of decisions, rules are propositions that can be read much like a statement of fact.