Usability

Usability is a general term that describes how an interface or experience functions for users. It refers to how users can perform tasks in a frustrating-free, efficient, and delightful way.

The more usable a product or service, the less difficult it is to engage with, the easier to understand (or more intuitive), and the more pleasant the experience will be for users.

Usability is a key tenet of interaction design, product design, and service design.