A Touch-Tone Phone is a type of telephone that uses a keypad with buttons instead of a rotary dial. Each button corresponds to a specific number or symbol, and pressing a button sends a unique tone to the phone network. This technology allows for quicker and more efficient dialing compared to older rotary phones. Introduced in the 1960s, Touch-Tone Phones became popular due to their ease of use and speed. They paved the way for modern telecommunication devices, including mobile phones and smartphones. Today, most phones, including landline phones and cell phones, utilize similar keypad technology.