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Knowledge-based systems
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<p>A knowledge-based system (KBS) is a <a href="/facts/Computer_program/e38jH9N9">computer program</a> that <a href="/facts/Automated_reasoning/x5EdkKoU">reasons</a> and uses a <a href="/facts/Knowledge_base/zKXdqQjH">knowledge base</a> to <a href="/facts/Problem_solving/9cuLz5pH">solve</a> <a href="/facts/Complex_systems/eGG3B1nn">complex problems</a>. Knowledge-based systems were the focus of early <a href="/facts/Artificial_intelligence/lJGauQwX">artificial intelligence</a> researchers in the 1980s. The term can refer to a broad range of systems. However, all knowledge-based systems have two defining components: an attempt to represent knowledge explicitly, called a <a href="/facts/Knowledge_base/zKXdqQjH">knowledge base</a>, and a <a href="/facts/Reasoning_system/V6c6TToD">reasoning system</a> that allows them to derive new knowledge, known as an <a href="/facts/Inference_engine/oLlNX14Q">inference engine</a>. </p>