What is card sorting in an app?
What is card sorting? Card sorting is a UX design user testing technique that focuses on establishing the best structure for an IA. That is, to make both labels and groups on websites or apps more intuitive to users by considering how they would organize the information on your site.
Why is card sorting useful in UI design?
Card sorting is a highly useful technique in information architecture; it is used to understand how users think about your content. It can help you organize content so that it suits your users' mental models, rather than the point of view of your company.