An information system is defined as the software that helps organize and analyze data. So, the purpose of an information system is to turn raw data into useful information that can be used for decision making in an organization.
Transaction Processing Systems (TPS)
Management Information Systems (MIS)
Decision-Support Systems (DSS)
Executive Support Systems (ESS) * Communications systems * Collaboration systems Office automation systems here are various types of information systems, for example: transaction processing systems, decision support systems, knowledge management systems, learning management systems, database management systems, and office information systems.

A combination of hardware, software, infrastructure and trained personnel organized to facilitate planning, control,coordination, and decision making in an organization.
Stakeholders:
* System owners * System Owners System owners – an information system’s sponsor and executive advocate, usually responsible for funding the project of developing, operating, and maintaining the information system * System users * System Users System users – a “customer” who will use or is affected by an information system on a regular basis – capturing, validating, entering, responding to, storing, and exchanging data and information. * Project manager * Internal System Users • Clerical and service workers • Technical and professional staff • Supervisors, middle managers, and executive managers * Systems analyst * System designer * System builders External Service Provider (ESP) External System Users • Customers • Suppliers • Partners • Employees • Remote users - users who are not physically located on the premises but who still requires access to information systems. • Mobile users - users whose location is constantly changing but who requires access to