Card Sorting is a UX research technique used to understand how people naturally organize information, which in turn helps designers create an intuitive Information Architecture for websites or apps. In a card sorting session, participants are given a set of topics or content items (each item is written on a card, whether physical or digital) and asked to group those cards in a way that makes sense to them. There are two main types: open card sorting, where participants name the groups they create (revealing the labels they’d use), and closed card sorting, where participants sort items into predefined categories. For example, if designing a clothing retail site, a card sort might involve product types and let users group them — one user might group by “Men/Women/Accessories,” another by “Clothing/Shoes/New Arrivals,” etc. By analyzing results from many users, designers can identify patterns in how users think about the content. This informs the site’s navigation menus, category names, or structure so that it aligns with user expectations, ultimately making information easier to find.