Discuss the business of a barbershop or hair salon. Name the entities that are the ""main things"" about this business. Give examples of instances for each entity.

An entity is an abstract category or grouping of things that share a common quality, and an instance, is a particular form or type of the entity.

In a barbershop, the main entities would be:

Barbers Hair Cutting instruments Furniture

And some instances for each entity would be:

Barber - Barber A, Barber B, Barber C, each representing a different person. Hair Cutting instruments - razors, blades, clips. Furniture - chairs, counter, mirrors, brooms, bulbs.