The expert system is an artificial intelligence based system that converts the knowledge of an expert in a specific subject into a software code. This code can be merged with other such codes (based on the knowledge of other experts) and used for answering questions (queries) submitted through a computer. It is mainly developed using artificial intelligence concepts, tools, and technologies, and possesses expert knowledge in a particular field, topic or skill. Expert systems typically consist’ of three parts:
(1) a knowledge base which contains the information acquired by interviewing experts, and logic rules that govern how that information is applied;
(2) an Inference engine that interprets the submitted problem against the rules and logic of information stored in the knowledge base; and an
(3) Interface that allows the user to express the problem in a human language such as English. Despite its earlier high hopes, expert systems technology has found application only in areas where information can be reduced to a set of computational rules, such as insurance underwriting or some aspects of securities trading. Also called rule-based system.
Expert systems have played a large role in financial services, healthcare, manufacturing, and video games. It is a computer program that uses artificial intelligence (AI) technologies to simulate the judgment and behavior of a human or an organization that has expert knowledge and experience in a particular field.