A person or organization outside your organization who receives the output of a process. Of all external customers, the end-user should be the most important.
The customers outside the organisation. These may also include other customers in the chain of distribution. In an outsourced situation, external customers often refers to those outside the scope of the contract but still within the organisation.
Dealers, who buy products to sell to others, and ultimate customers (or end users), who buy products for their own personal use.