The Deming Cycle, also known as the plan-do-check-act (PDCA) cycle, is a four-step method for continuous improvement and learning. It involves planning an improvement, doing or implementing it, checking the results, and acting on what is learned through repetition of the cycle. The PDCA cycle structures improvement projects systematically by planning a change, executing the plan, measuring the results, and determining what actions to take next. It is used to manage initiatives for continuous organizational improvement through repetitive learning cycles.