Push-button phones, also known as touch-tone phones, are a type of telephone that uses buttons instead of a rotary dial to make calls. Each button corresponds to a specific number or function, allowing users to dial numbers quickly and easily. This technology became popular in the 1960s and replaced older rotary phones, which required users to turn a dial for each digit. These phones typically feature a keypad with numbers 0-9, along with additional buttons for functions like star (*) and pound (#). Push-button phones are user-friendly and have paved the way for modern communication devices, including mobile phones and smartphones.