A keypad is a set of buttons arranged in a specific layout, used for inputting data or commands into electronic devices. Commonly found on devices like telephones, computers, and security systems, keypads can be mechanical or touch-sensitive. They typically feature numbers, letters, and symbols, allowing users to enter information easily. Keypads can vary in design, from simple numeric keypads to more complex ones with additional functions. Some keypads are integrated into devices, while others are standalone units. They play a crucial role in user interfaces, enabling efficient interaction with technology in everyday life.