4 Pin DuPont connector with housing and pins. 2.54mm pitch (distance between each pin). Commonly used on printers for connecting stepper motor wiring to controller boards. 

Usually connected to straight header pins. Not designed and may not work with JST connectors. Not for high current use.

To use, strip the insulation from wire and crimp the pins to each wire lead. Orientate the pin with the latch facing towards the opening on the backside of the DuPont connector. Insert the pin into the housing until it latches in place.