Usability design primarily concerns what aspect of application development?

Usability design focuses on ensuring that applications are accessible and easy to use for all users. This involves creating interfaces that are intuitive, efficient, and simple to navigate, allowing users to complete their tasks with minimal frustration. Key elements of usability include clear navigation, logical flow, and a user-friendly design that accommodates different levels of user expertise.

In this context, accessibility entails not only physical access for users with varying abilities but also making sure that the application is easily understandable and operational for everyone. This aligns with the overall goal of enhancing user satisfaction and improving the likelihood of successful interaction with the application.

While artistic design and aesthetics are important for an appealing interface, they are secondary to ensuring that the application is functional and user-friendly. Security measures, on the other hand, do play a crucial role in application development but are generally classified under a different domain than usability design.