From module J2,
Drogues: First developed by the Klingons in 2278 (Y178) as an outgrowth of mech link technology, these were quickly copied by other races and came into widespread use by 2280 (Y180). The basic idea was a structure that could be towed about 5km behind the ship on a "tractor-tether". The drogue could then be used for various purposes (launching drones or plasma torpedoes, electronic warfare, and other purposes). There were several types of drogues, each with their own unique abilities.