They think and act as a Collective thanks to subspace communications present as a net between them. Their purpose is to improve themselves by assimilating the other life-forms. They`re totally rational: there are no emotions in the Collective. This rationality can be seen in the shape of their ships: they are huge cubes and are almost undestructable; they are vulnerable at the highest EM band, but they quickly adapt to these frequences. They are able to produce superabundant energy, so they can work even if the 78 percent of the ship is inoperative. They can use impulse speed, warp speed and their special speed known as "Transwarp Speed". In "Descent", however, we see a new type of ship, which is not symmetrical but very huge, just like the cube vessels. This change of shape seems to be a reaction to the Borg`s new individuality, but it may just be an improvement of the Borg technologies. It is almost certain that the Borg Homeworld is in the delta quadrant. The Starfleet thinks that the Borg drones grow as normal humanoids in the first period of their life. Then they are implanted cybernetical parts and are finally put to their place in the Collective. Each Borg has different devices on his body, so each one has a different job in the Borg society. It is supposed that the Borg are able to make their drones grow to adult beings within months. We do not know how many years a Borg life is long. The Collective is not able to disconnect one Borg from the others in normal situations: it would be like disconnecting one arm, we can`t do it. But if a Borg is injured, he immediately disintegrates leaving nothing to the Collective`s enemies` scientists. The Borg collective consciousness is divided in sub-commands: defense, communication, navigation. Main commands are protected with an access password.
ASSIMILATION
The assimilation process begins when two long tubules are inserted inside a prospective drone's skin. Once inside, the tubules release nano-probes into the blood-stream. After the nano-probes have accomplished their tasks, artificial implanting may begin. The process begins
TECHNOLOGY
Borg ships are cubical or spherical in shape. They have no command center of any kind, and no engineering section. Borg drones are equipped with personal force-fields. They are very powerful, and highly adaptive. If you can get one good shot off on the Borg, you will likely get few more. This adaptability makes it necessary to keep your weapon on a rotating modulation. However, the Borg will eventually adapt to all frequencies, draining your weapon, and forcing you to fight hand to hand, and then, they will most likely win, if not greatly outnumbered.