Bacta is a healing substance available from the planet Thyferra, where two competing cartels, the Zaltin and Xucphra corporations, control almost all of the product. Bacta was invented by the insectoid Vratix of Thyferra by mixing alazhi salve with a synthetic liquid chemical called kavam. This concoction is further mixed with a colorless viscous liquid called ambori. During the Galactic Civil War, the Empire realized the importance of bacta and shut down all satellite manufacturing centers, allowing the bacta plants on Thyferra to have a total monopoly on production. It is much more available than kolto, since the Empire occupied Manaan, severing the connection between the Selkath and the Rebel Alliance. It mimics the body's fluids and helps in regeneration. It is used to help with cuts and burns as well as severe cellular damage, such as frostbite.
There are several methods of bacta application. Cuts and burns can be treated with bacta patches, small disposable patches covered in bacta gel or by injection. Those suffering from serious illnesses, or serious injuries - such as frostbite - are helped by becoming submerged in the liquid in bacta tanks, such as the one that cured Luke Skywalker in The Empire Strikes Back. Also, General Grievous was put into a bacta tank after being critically injured in a shuttle crash that eventually led to the creation of his fearsome bio-droid body.
Additionally, bacta seems to have a dramatically regenerative effect on Gand.
Bacta is in many Star Wars videogames; it is often used to heal the main character in the game. This is true in Jedi Knight: Jedi Academy Jedi Knight II: Jedi Outcast, Revenge of the Sith, Battlefront, Battlefront II and Republic Commando. Usually, the bacta is held in small cylinders, or in a robotic structure that has a seemingly endless supply. The player's custom characters in Lego Star Wars II: The Original Trilogy are normally held in bacta tanks until they are chosen to be the main player in a level. In one of the missions of X-Wing Alliance the player has to escort bacta to a rebel hospital.
Read more about this topic: List Of Star Wars Substances