However the most important on Computer is how to collect Data, Information and Knowledge in one frame.
A Computer-Based information System (CBIS) is an information system that uses computer technology to perform some or all of its intended tasks. Even though not all information systems are computerized, the reason is not everybody know how important the database for all the people’s.
It contains Hardware, Software, Database, Network and Procedures. All of the people’s use all the components to develop information systems, oversee security and risk and manage all data.
Reference : Introduction to Information System By R Kelly Rainer & Casey G Cegielski