Knowledge-Based Systems (KBS) are computer programs designed to solve complex problems by simulating human reasoning. They utilize a vast database of information, known as a knowledge base, which contains facts and rules about a specific domain. By applying logical reasoning, KBS can provide solutions, make decisions, or offer recommendations based on the data they process. These systems often incorporate artificial intelligence techniques, such as expert systems, which mimic the decision-making abilities of human experts. KBS are widely used in various fields, including medicine, finance, and customer support, to enhance efficiency and improve decision-making processes.