A Male-to-Male (M-M) wire is a simple jumper wire used in electronics and prototyping to connect two female headers, connectors, or sockets. Both ends of the wire have male pins (like straight pins), which can be easily inserted into breadboards, female headers on modules, or Arduino/ESP boards. 🔹 Key Features Connector Type: Male pin on both ends. Length: Available in different sizes (10 cm, 20 cm, 30 cm, etc.). Colors: Usually available in multiple colors for easy identification. Compatibility: Works with breadboards, Arduino, Raspberry Pi, sensors, and modules. Material: Copper conductor with plastic insulation. 🔹 Usage Breadboard connections: Connect components across rows or columns. Arduino / ESP32 / Raspberry Pi projects: Connect modules and sensors that have female header pins. Prototyping: Quickly test circuits without soldering. Signal, power, and ground connections. 🔹 Types of Jumper Wires Male-to-Male (M-M): Both ends are pins → for breadboard & female headers. Male-to-Female (M-F): One end pin, other end socket → connect male headers to female headers. Female-to-Female (F-F): Both ends sockets → connect two male pins. 🔹 Example If you have an Arduino UNO and an IR sensor module, the IR module usually has female pins (VCC, GND, OUT). You use Male-to-Male wires to connect these pins to the female headers on the Arduino.