A management information system (MIS) provides information to help organizations manage efficiently and effectively. An MIS involves people, technology, and information. It analyzes operational activities to support decision making. Early computers tracked basic data, but over time MIS applications became more complex and integrated. Today, MIS includes systems like ERP, SCM, and CRM. Knowledge-based systems are artificial intelligence tools that provide intelligent decisions in a specific domain using knowledge representation techniques. Decision support systems compile information from various sources to support problem solving and decision making. Online analytical processing enables analyzing multidimensional data interactively to help users make better decisions.