internal customers & external customers 有咩分別?

Types of customers
Customers can be classified into two main groups: internal and external. Internal customers work for the organisation, possibly in another department or another branch. External customers are essentially the general public.
Internal Customers
People working in different departments or branches of the supplier's organisation
Individuals or departments within an organization that receive a good or service from another individual or department within the organization.
External Customers
Individuals or organizations (which could be described as a party) that receive a good or service in return for compensation, typically monetary.
Businesses or businesspeople, including partners, bankers and competitors.
NGOs, Government Bodies, Voluntary Organisations.