We’ll start here with a quick survey of the most popular types from JST ... are frequently mislabeled and some connectors look too much alike. The Molex PicoBlade is a 1.25 mm pitch connector ...

Often refers to the 4-pin connectors used to attach DC power to the drives inside a PC cabinet. Molex is a large manufacturer of electronics plugs and sockets that dates back to the 1940s.