Usability focuses primarily on which of the following factors?

Usability primarily emphasizes user satisfaction, which encompasses how effectively and efficiently users can interact with a system or product to achieve their goals. It reflects the overall experience users have while using a product, including their comfort and pleasure during interaction. High usability implies that users find a system intuitive and enjoyable to use, leading to a more positive engagement and a greater likelihood of continued use.

User satisfaction is a central theme in usability studies because it directly influences a product's success or failure in the marketplace. When users are satisfied with a product’s usability, they are generally more willing to continue using it and recommend it to others. Therefore, understanding and measuring user satisfaction is crucial for designers and developers in creating products that meet the needs and expectations of their target audience.