In a multi environment, an RDMS engine capable of functioning on a multi user operating system is used. Now, multiple users’ request for table data will be responded to by the RDMS engine. In this scenario, the computer on which the RDMS engine is loaded and run, which responds to multiple user requests for table data concurrently, is called the RDBMS server. If Oracle is the RDBMS engine being used then this is called the Oracle Server.
Related : What do you mean by Oracle Database Administrator?

Submitted to RB by Angel Fish