Final answer:
A contract between internal and external customers is commonly referred to as a service level agreement (SLA).
Step-by-step explanation:
A contract between internal and external customers is commonly referred to as a service level agreement (SLA). An SLA is a legally binding contract that defines the services, performance standards, responsibilities, and expectations between the service provider (internal customer) and the customer (external customer).
For example, in the context of an IT department, an SLA might outline the level of technical support, response times, and uptime guarantees that the IT department will provide to other departments or external clients.
In summary, a contract between internal and external customers is called a service level agreement (SLA). A contract between internal and external customers is commonly referred to as a service level agreement (SLA).