A knowledge-based system is a computer program that reasons and uses a knowledge base to solve complex problems.

Knowledge-based authentication, commonly referred to as KBA, is a method of authentication which seeks to prove the identity of someone accessing a service such as a financial institution or website.

the application of knowledge-based systems technology to the domain of manufacturing design and production.

Knowledge-based recommender systems (knowledge based recommenders) are a specific type of recommender system that are based on explicit knowledge about the item assortment, user preferences, and recommendation criteria (i.e., which item should be recommended in which context).