what are the importance of information systems? and What are the categories or types of information system and give an example. thanks

Information system is crucial to collect, arrange, store,
process and distribute necessary information at the required times to the required
personnels. Usually informaton is much required for day- to- day operations of business,
to confront growing competition and to enusre efficient management of the business.
Therefore, informaton system has been of great concern to the business management and
operations. Along with, information system is also concerned with decision making. there
several types of informaation systems as mentioned
under;

1. Management Information System (MIS);- The
   MIS is useful to deal with well structured problems, decision making as the system
   provides necessary information in relation to the external environment. It also provides
   necessary facts, figures in graphs, bar diagrams etc.
   


2. Decision Support System (DSS);- This is a computer
   application program that provides necessary information only for decision making.
   


3. Marketing Information System (MKIS);- This provides
   necessaru information related and required in marketing field. However it is also one of
   the computer application program.


4. Human Resource
   Information System (HRIS);- the HRIS is much essential in the field of Human Resource
   Management. this provides the information related to the data of personnels working in
   the organization. it is also helpful to prepare Human Resource Inventory Report and the
   succession Planning Report.


5. Others;- Besides the above
   mentioned Informaton System, there are several other types of information system used in
   specialised sectors.