# Adaptive Systems > **Machine-Evolution Nexus:** [[articles/Digital Darwinism and the Invisible World of Machine Evolution|Digital Darwinism and the Invisible World of Machine Evolution]] supplies a taxonomy for adaptation by learning, feedback and evolution. ## Definition **Adaptive systems** change behavior or internal organization in response to environmental feedback. ## Evidence Boundary Adaptation is broader than Darwinian evolution. A single controller can learn without reproducing, while a population can evolve without any member learning during its lifetime. ## Relationships [[wiki/Evolutionary Algorithms|Evolutionary Algorithms]], [[wiki/Machine Learning|Machine Learning]], [[wiki/Cybernetics|Cybernetics]], [[wiki/Evolutionary Dynamics|Evolutionary Dynamics]]