ChatGPT said: In electronics, buttons (also called push buttons or switches) are simple input devices used to make or break a connection in a circuit. When the button is pressed, it closes the circuit and allows current to flow; when released, it opens the circuit and stops the flow of current. They are mechanical components, usually made with spring-loaded contacts that return to their original position after pressing. Buttons come in different types such as momentary (ON when pressed, OFF when released) and latching (stay ON until pressed again). They can be small tactile switches, large push buttons, or even illuminated buttons with built-in LEDs. In microcontroller projects like Arduino, ESP32, or NodeMCU, buttons are widely used as user input devices for tasks like starting/stopping a process, resetting the system, or navigating menus. Because of their simplicity and reliability, buttons are found everywhere — from toys, calculators, and remotes to industrial machines, elevators, and control panels.