A "push-button" is a simple mechanical or electronic device that activates a function when pressed. Commonly found in various appliances and machines, push-buttons can control anything from lights to complex machinery. They are designed for ease of use, allowing users to perform tasks quickly and efficiently. In modern technology, push-buttons are often integrated into devices like smartphones and computers. They can be physical buttons or virtual ones on a touchscreen. The concept of a push-button is essential in user interface design, as it provides a straightforward way for users to interact with devices and applications, enhancing overall usability.