Knowledge-based agents are those agents who have the capability of maintaining an internal state of knowledge, reason over that knowledge, update their knowledge after observations and take actions. These agents can represent the world with some formal representation and act intelligently.“Logical AI: The idea is that an agent can represent knowledge of its world, its goals, and the current situation by sentences in logic and decide what to do by inferring that a certain action or course of action is appropriate to achieve its goals.”