Which of the following best describes usability?

Usability is fundamentally about how effectively and efficiently users can achieve their desired goals when interacting with a product. This involves evaluating how easy and intuitive the product is for users, which directly impacts their overall experience and satisfaction. When a product is designed with high usability, it allows users to accomplish tasks seamlessly, therefore enhancing their interaction with the product.

In contrast, while visual appeal is an important aspect of design, it does not encompass the broader context of usability, which focuses on functionality and user satisfaction. Marketing effectiveness relates more to how well a product is promoted and received in the marketplace rather than its functionality from a user's perspective. Additionally, complexity of technology may affect usability; however, usability itself is more concerned with the user's ability to navigate and utilize that technology, regardless of its complexity. Hence, the focus on user goals in defining usability makes the choice about ease of achieving these goals the most accurate descriptor.