Kano Model is a technique that categorizes customer requirements into three types: 1) Delighters 2) Satisfiers, and 3) Dissatisfiers.
Delighters are features that customers don’t know they want, but are delighted to find them — “bonuses.” Satisfiers are features that customers are aware of and not necessary, but improve customer satisfaction. Dissatisfiers are features that customers absolutely require, the absence of which result in customer dissatisfaction.