Pin header connector, a type of connector, English name: Pin Header. This connector is widely used in PCB circuit boards in electronics, electrical appliances, and meters. Its role is to serve as a bridge between blocked or isolated circuits in the circuit and carry the current or signal transmission task.

Pitch refers to the distance or space between two pins in the electronic community, more details check Wikipedia. -2.54mm (.100”) inch pitch pin header connectors ( typically and widely used) -2.00mm (.079”) inch pitch pin header connectors (widely used) -1.27mm (.050”) inch pitch pin header connectors ( used as well)