The definition of WebLogic Domain is translated for the first time:]

What Is a WebLogic Domain?
What is WebLogic Domain?
The basic administrative unit for WebLogic Server is a domain.
The basic management unit of the WebLogic Server is a Domain.
A domain is an interrelated set of WebLogic Server resources that are managed as a unit.
A domain is a collection of related settings as the WebLogic Server resources managed by a unit.

A domain names des one or more WebLogic Server instances, and may also include WebLogic Server clusters.
A domain includes one or more WebLogic Server instances, or a WebLogic Server cluster.
Clusters are groups of WebLogic Servers that work together to provide scalability and high-availability for applications.
A cluster is a WebLogic Servers group that work together to provide reliable and efficient applications.
One instance of WebLogic Server in each domain is configured as an Administration Server.
WebLogic Server instances in each domain are configured by the Administration Server.
The Administration Server provides a central point for managing a WebLogic domain.
The Administration Server provides a central point for managing WebLogic domains.
All other WebLogic Server instances in a domain are called Managed Servers.
All other WebLogic Server instances are called Managed Servers in the domain.
In a domain with only a single WebLogic Server instance, that server functions as both Administration Server and Managed Server.
When a domain has only one WebLogic Server instance, this Server provides both the Administration Server and management Server functions.