CEVAP:

The product hierarchy stretches from basic needs to particular items that satisfy those
needs. We can identify six levels of the product hierarchy.

Need Family
• The product need is the primary reason for the existence of a product.

Product Family
• All the product classes that can satisfy a core need with reasonable effectiveness. In
product family, the core need satisfied by a product is the focus. 

Product Class
• A group of products within the product family recognized as having a certain functional coherence, also known as product category.

Product Line
• Product line is a group of products within a product class that are closely related because they perform a similar function, sold to the same customer groups, marketed through the same outlets or channels, or that fall within given price ranges.

Product Type
• A group of items within a product line that share one of several possible forms of the product.

Item or Product Variant
• A distinct unit within a brand or a product line distinguishable by size, price, appearance or some other attributes.