Oracle is a multi-user database management system - A software package specializing in managing a single, shared set of information among many concurrent users. Oracle is one of many database servers that can be plugged into a client/server equation. Oracle works to efficiently manage its resource, a database of information, among the multiple clients requesting and sending dta in the network.
Oracle has many important freatures that make it not only an exceptional database management system, but also an excellent database server choice for client/server computing. Oracle supports all major operating systems for both clients and servers, including MSDOS, NetWare, UnixWare, OS/2 and most Unix flavors. Oracle networking software, SQL*Net, also supports all major network communication protocols, including TCP/IP, SPX/IPX, Named Pipes and DEC-Net. Therefore, Oracle can be the link which joins the many data stores and networks throughout the heterogeneous computing systems prevalent in most corporations.

BENIFITS OF ORACLE
Oracle has many advantages and features that makes it popular and thereby makes it as the world's largest enterprise software company. Oracle comes with new versions with new features implemented in new version while the features of earlier versions still being maintained. One important aspect is Oracle databases tend to be backwards compatible. Also when Oracle releases a new version, their documentation contains a list of all the features new to that version thus makes it user friendly for one to learn the new features.