Which term describes an interaction that suggests what actions are possible?

The term that best describes an interaction that suggests what actions are possible is "affordances." Affordances refer to the attributes of an object that indicate how it can be used or interacted with, essentially highlighting the possible actions. For example, a button on a web interface often looks clickable, suggesting that the user can press it. The design elements convey their function through their appearance and context, making it intuitive for users to understand what actions they can take.

In contrast, constraints limit the actions that can be performed, feedback provides responses or information regarding the outcome of an action, and mapping refers to how controls relate to their effects in the interface. Understanding affordances is crucial in interactive design as it helps create intuitive user experiences that guide and inform users on how to interact effectively with a system.