"A marketing information system is a continuing and interacting structure of people, equipment and procedures to gather, sort, analyse, evaluate, and distribute pertinent, timely and accurate information for use by marketing decision makers to improve their marketing planning, implementation, and control".
Strategic information systems are information systems used to create and maintain an organization's competitive strategy.
SIS are also systems that are used to prevent the organization's competitors from gaining a competitive advantage.
A marketing information system helps organizations collect, store, and analyze data about customers.
This data can then be used to aid in decision-making about a large range of marketing activities (e.g., product positioning, pricing, customer segmentation).