DB2 is a database product from IBM. It is a Relational Database Management System (RDBMS). DB2 product is extended with the support of Object-Oriented features and non-relational structures like XML.
An iSeries computer is geared mainly to serve the demands of DB2. The IBM System i is IBM’s previous generation of midrange computer systems for IBM i users. IBM i is operating system, for Example: i5/os.
Midrange computers are a class of computer systems which fall in between mainframe computers (used by large organizations) and microcomputers.