The 4×4 Matrix Keypad is a compact input device featuring 16 push buttons arranged in a matrix layout (4 rows × 4 columns). It is widely used in Arduino and embedded systems for user input, password entry, and menu navigation.

This keypad operates using a matrix scanning method, which reduces the number of pins required for interfacing. It connects easily to microcontrollers such as Arduino, AVR, PIC, and Raspberry Pi.

Made with a durable membrane design, the keypad is lightweight, easy to install, and suitable for both beginner and professional projects. It is commonly used in security systems, control panels, and DIY electronics.