+A keypad is a set of buttons, often numeric or alphanumeric, arranged in a block or pad. It serves as a human-interface device for data entry or command input into a [machine](/wiki/machine) or [system](/wiki/system). From phones to security doors, keypads offer a direct way to communicate with technology.
+## See also
+- [Button](/wiki/button)
+- [Input Device](/wiki/input_device)
+- [User Interface](/wiki/user_interface)
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