At a somewhat more pragmatic level, David Garvin of the Harvard Business School suggests that “quality is a complex and multifaceted concept“ that can be described from five different points of view.
The transcendental view argues that quality is something you immediately recognize. but cannot explicitly define.
The user view sees quality in terms of an end user's specific goals. If a product meets those goals, it exhibits quality.
the manufacturer's view defines quality in terms of the original specification of the product. if the product conforms to the spec, it exhibits quality.
The product view suggests that quality can be lied to inherent characteristics of a product.
Finally,
the value based view measures quality based on how much a customer is willing to pay for a product. In reality, quality encompasses all of these views and more.