What is CICS?

CICS stands for Customer Information Control System that is a very powerful transaction processing system. It is most widely used by financial institutions, colleges and universities, airline reservation systems, insurance companies, ATM systems, as well as state and national governments. CICS can also perform other important task like batch job submissions, catalog updating, domain management, and application bridging.

CICS is written in Web-based and incorporate Enterprise Java Beans language for handling the big number of  transaction but is able to handle small transaction as well. It also provide online batch activity as well.   

CICS was originally developed in the U.S. in 1969 for small and medium mainframe systems. It can run on various operating system including z/VSE, i5, OS/2, AIX, Linux, Mac OS, and Windows as well as IBM's 64-bit z/OS.