When we create this kind of class, we are gathering together the software that implements a concept that is critical to the business, and separating it from every other concern in the automated system we are building. This class stands alone as a representative of the business. It is unsullied with concerns about databases, user interfaces, or third-party frameworks. It could serve the business in any system, irrespective of how that system was presented, or how the data was stored, or how the computers in that system were arranged. The Entity is pure business and nothing else.
