Pin, a connector, English Name: pin header. This kind of connector is widely used in PCB circuit board of electronic, electrical and instrument. Its function is to play the role of bridge between the circuit which is blocked or isolated, and it is responsible for the task of current or signal transmission. Usually used with the busbar, forming a plate to plate connection; Or it is used with the electronic harness terminals to form a board to wire connection; It can also be used for connecting the board and the board independently. Because the specifications of different products are different, there are also many types and specifications of needle arrangement. They are classified according to the standard of pin connector in electronic industry: according to the spacing, they can be roughly divided into 2.54mm, 2.00mm, 1.27mm, 1.00mm, 0.8mm and five types of single row needles, double row pins, three row pins, etc; According to the packaging rules, SMT (horizontal / vertical paste), plug-in dip (straight / bent) and so on. A type of connector, English Name: female header. It is a kind of universal connecting device widely used in electronics, electrical appliances and instruments, which mainly plays the role of current or signal transmission. Usually used with needle arrangement, it forms a plate to board connection.