Pin headers are one of the most flexible and adaptable components used to connect a cable/module or board-to-board interface on a printed circuit board. This guide covers connector basics, types of pin headers, and practical considerations when selecting a header to connect peripherals or stack expansion boards. From a simple 2.54 mm breakaway header strip on a breadboard to a boxed, shrouded PCB connector with IDC ribbon cable, reliable integration across Arduino, Raspberry Pi, and cus