Also called knowledge-based system, Computer Program that uses Artificial Intelligence techniques to make decisions or recommendations or predict outcomes based on
an analysis of data. An expert system typically has two parts: a very large
database that contains specified knowledge in a given area and a set of rules
(called the knowledge base) for reaching conclusions. Often, the rules are an
elaborate set of if…then statements. Expert systems have been applied to chemistry, geology, genetic Engineering, medicine, and pharmacology.