Usability refers to the ease of use and user satisfaction with a product or system. It is a measure of how well users can interact with a product to achieve their goals efficiently and effectively.

In other words, usability is a measure of how easily a user can learn to use a product, how efficiently they can perform tasks with it, and how satisfied they are with the experience.

Usability is often evaluated through user testing, where participants are asked to perform specific tasks with a product, and their interactions are observed and recorded. This data is then analyzed to identify areas where users struggled or became frustrated, and improvements can be made to enhance usability.

The goal of usability is to design products that are intuitive, easy to use, and enjoyable for users. By prioritizing usability, companies can improve customer satisfaction, reduce support costs, and increase productivity.