What is difference between affordance and functioality?

Affordance refers to the perceived possibilities for action that an object provides to a user, essentially indicating how the object can be interacted with based on its design. Functionality, on the other hand, pertains to the actual capabilities and features of an object or system, detailing what it can do. While affordance is about user perception and interaction cues, functionality is concerned with the practical operations and tasks the object can perform. In essence, affordance guides users in using a product, while functionality defines the product's actual performance.