Stated needs are those that are clearly specified by the customer. It’s what the customer requests.
Real needs are one level above stated needs; they are more specific and define the parameters that are immediate to defining and fulfilling the need.
Unstated needs are what the customer also expects but doesn’t ask for.
Delight needs are those that provide the “wow” factor. These needs, like unstated needs, can make some products more desirable than others if they meet those needs.
Secret needs are those that a customer may not state or realize but can be one of the main reasons for choosing a particular product to fulfill the basic stated need.