Unshrouded – no wall, so alignment is on the receptacle
This header has no shroud (unshrouded), meaning the pins are exposed above the housing base. In a board-to-board stack, the opposite connector's housing walls guide the mate; in a cable application, the plug housing does the centering. The push-pull fastening type means there is no latch – the connection is held by friction from the contact interface alone.
A close peer is the 953440-3 – also a 6-position, dual-row, right-angle header at 0.100" pitch, but it is fully shrouded (4-wall) with a friction lock and board guide, and its contacts are tin-plated rather than gold. The 825457-3 trades the mechanical alignment and latch for a gold mating interface and a lower profile. If the application needs positive locking and pin protection from the header side, the 953440-3 is the alternative; if the mating receptacle already provides those, the 825457-3 saves board space and cost.