A colourless, watery liquid, Bacta has incredible healing properties. Administered in a variety of manners, but the most effective is to entirely immerse the body in a tank full of the substance. Bacta promotes tissue regeneration and prevents the formation of scar tissue.
As such, it is an effective treatment for nearly any kind of injury, in a great number of species across the galaxy. Its nature is unknown, but the name suggests it may actual be some sort of incredibly potent anti-biotic bacteria.