Affordances

James Gibson, the psychologist described affordances as "action possibilities" in the environment
It is the property of an object that clearly defines how it should be used
Some objects based on their size and shape shows you how to handle them.

How Does This Relate To Design?

Think about affordance cues when you are designing
For people to know what your object does and how to take action on it, make sure its easy to interpret and perceive. Ex. Designing a website and adding shadows behind buttons to show they are clickable and to be pushed in

Below are some examples of Affordances in objects and design: