Touch-tone refers to a system of dialing telephone numbers using a keypad that produces specific tones for each button pressed. This technology replaced the older rotary dial system, allowing for quicker and more efficient dialing. Each button corresponds to a unique frequency combination, enabling the telephone network to recognize the number being dialed. Introduced in the 1960s, touch-tone technology became widely adopted due to its convenience. It is commonly used in modern telephones, including mobile devices and landlines. The system is also integral to various automated services, such as interactive voice response systems, which allow users to navigate menus using their keypad.