This is Transaction Server.
CICS can manage large volumes of transactions. CICS allows transactions to run concurrently at the same time serving many online users.
CICS offers ACID properties. CICS allows sharing of data and resources.
Different CICS services are exposed through a rich set of API(Application programming interface) commands.
To make Cobol program(s) interactive, we code special CICS API commands in the program. CICS programs are not very different from ordinary Cobol programs.
Transaction :
A transaction is the basic unit-of-work in online systems. A transaction runs one or more programs to process the data. A user types the input data on the computer screen, and presses Enter to start the transaction. The transaction invokes one or more programs to process the data right away. Immediately, the output results are displayed on the terminal and the transaction ends.
A single business-transaction(such as enrollment of a customer, retirement of an employee) may involve one or more CICS transactions.
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