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Membrane keyboards are a type of keyboard that uses a flexible, flat surface with printed circuitry to register key presses. The keys are typically made of rubber or silicone, and when a key is pressed, it pushes down on the membrane layer to complete a circuit and send a signal to the computer. These keyboards are known for their quiet operation and slim profile, making them popular for use in offices, homes, and other environments where noise and space may be a concern.