All learning technologies have a set of affordances that makes some actions possible while limiting others. Essentially, an affordance is a quality or feature of an object, or of an environment, that allows an individual to perform an action. For example, the handles on a teacup allow it to be lifted without burning one’s hand. This is a key affordance of a teacup. The speakers on a home theatre system allow us to hear high-fidelity sound. This is a key affordance of those speakers.
by Gary Woodill