Information system has become universal in our daily business activities such as human resource management, marketing, finance or any other important business function. The information system plays a fundamental role in providing management with control over their data and in running successful companies. They constitute a significant field of study in business administration and management, and this is the most included business imperative in an information systems course. If we want to understand the information system and its functions, we must first be sure of the system concepts. A good basis of understanding is to give a clear definition: Information system is technically defined as a set of organized components that collect, store, distribute, process, transform information to approve decision making and control in an organization. The information system can also help managers and workers understand problems, analyze complex topics, and prepare new products. Today, the fundamental goal of companies is to be globally competitive by using the capabilities of modern information systems and communication technologies. The following are four types of information systems:1. Executive information systems. Executive information systems (EIS) are tools (software) that allow you to transform organizational data into useful summary reports and combine the features of management information systems and the decision support system. These reports are typically used by top executive managers for quick access to strategic information from company levels and departments such as billing, cost accounting, planning and more. The main goal of the EIS is for senior executives to be provided with direct and easy access to information... middle of the paper... logical judgments applied to the knowledge base whenever a user describes a situation the expert system . Although expert systems can aid decision making at any level of an organization, non-managerial employees are the primary users who use them to aid in work-related decisions. Expert systems have also successfully solved problems as diverse as diagnosing diseases, finding oil, and making soup. Features: Expert systems are part of an exciting branch of computer science called artificial intelligence. Artificial intelligence (AI) is the application of human intelligence to computers. AI technology can detect your actions and, based on logical assumptions and previous experiences, will take the appropriate action to complete the task. AI has a variety of capabilities, including speech recognition, logical reasoning, and creative responses.