2 pin C-type (with clips) AMP Junior Power Timer connector, commonly used for injectors and sensors (eg. manifold or intake air temperature, and coolant temperature, or transmission reed relay or back-up-light switch) or actuators (like idle air valve).

The black color is recommended: it includes receptacles and boot and small rubber seals (proper, one wire seal capable connector).

The green or natural colors are in a style that includes receptacles and boot. Note that this connector is not 1-wire seal capable. The black connector is much better, and recommended in general.