What aspect of a product does visual testing primarily focus on?

Visual testing primarily focuses on the visual appearance and layout of a product. This type of testing examines the user interface to ensure that it matches design specifications and that all visual elements, such as colors, fonts, images, and overall layout, are presented consistently and correctly across different devices and screen resolutions.

It is crucial because any discrepancies in the visual aspects can impact user experience, leading to confusion or misinterpretation of the information presented. By focusing on these elements, visual testing helps confirm that the product's aesthetic and usable interface aligns with user expectations and brand guidelines, ensuring an attractive and coherent presentation.

Other aspects, while important in the broader context of software testing, do not fall under the purview of visual testing. For example, performance metrics assess how well an application runs under various conditions, user functionality addresses how users interact with the software, and code structure examines the underlying architecture and organization of the code itself. These are all critical components of software development and quality assurance but do not pertain to the visual fidelity of a product.