Card sorting is a technique used to design and assess the information architecture of a given website.
Information:
A card sorting discussion allows participants to organize topics into classifications they perceive as meaningful, and they may also help you tag these categories. A card sort can be conducted using pieces of paper, actual cards, or online software. This process will help you to better understand your users' expectations and knowledge of your topics. You are likely to find it most effective after researching your users and analyzing your content. You can determine the structure of your website, what to include on the homepage, and how to label categories and navigation by learning how your users group information.