Customers can be segmented as internal and external. By demographics and by the type of laptop they use. Oops, that doesn't fit here. Internally customer and internal customer is directly connected to the organization and is usually but not necessarily internal to the organization. internal customers are usually stakeholders, employees or shareholders. The definition of internal customers can also include creditors and external regulators, external customers and external customer is not directly connected to the organization.
Some examples of external customers include a mom buying diaper for the baby customers who are crazy about phones by a Blackberry. Oops, that doesn't even happen now, right?