2f333d6f_UX_Techniques__UX_Mastery___Technique
[What It Is] Card sorting is a technique where users are asked to generate a folksonomy, or information hierarchy, which can then form the basis of an information architecture or website navigation menu. [When To Use It] Analysis [How To Use It] Check out Donna Spencer's book on Card Sorting for comprehensive coverage of the topic. [Technique] 
Card Sorting
UX Techniques -UX Mastery 
Technique