An Informatica domain is a collection of nodes and services. A node is the logical representation of a machine in a domain. Services for the domain include the Service Manager that manages all domain operations and a set of application services that represent server-based functionality.
The domain requires a relational database to store configuration information and user account privileges and permissions. The first time that you install the Informatica services, you must create the domain configuration repository in a relational database.
You use Informatica clients to access underlying Informatica functionality in the domain. The clients make requests to the Service Manager or to application services.