Usability refers to how easy and efficient a product, system, or service is for users to interact with. It focuses on the user experience, ensuring that tasks can be completed with minimal effort and confusion. Good usability means that users can quickly learn how to use a product and achieve their goals without unnecessary obstacles. Key factors that influence usability include design, navigation, and accessibility. A well-designed interface allows users to find information easily, while effective navigation helps them move through the system smoothly. Accessibility ensures that all users, including those with disabilities, can use the product effectively.