Borg drones made up the population of the Borg Collective.
A drone was an assimilated individual augmented with Borg technology and capable of assimilating others, be it an individual or technology, into the Collective. After assimilation a drone possessed no sense of individuality and served only the Collective.
Although both male and females of any susceptible species could be assimilated, Borg drones themselves were neither male nor female in a reproductive sense. The physiology of Borg drones varied because various species were assimilated into the Collective. Their organic bodies were enhanced, and some parts completely replaced, with cybernetic implants. The nature of these implants was determined by the drone's intended function, such as a tactical or medical repair drone. Every drone was equipped with a homing device, which had its own unique translink frequency, by which it was kept in contact with the Collective through subspace transceivers, thus forming the hive mind. The original species of a drone was often considered by the Collective when assigning a function.