Adventureworks sells products to Stores that then resell these products. These are called Resellers. It also sells products via it's online store directly to Individuals. These are known as Retail Customers.
As you can see from this Diagram, Adventureworks Customers includes both People (Retail Customers) and Stores (Resellers)
While there are many ways to handle this, in this training, we will denormalize both the Person Name and Store Name into a single field for our Customer Dimension.