The universe of Star Wars is a mix of ancient Rome, mythology and high technology. There are also some nods to Japanese mythology in the samurai era (see Darth Vader's helmet).
The action is located in a distant galaxy and is the scene of an incessant clash between Good and Evil. The Good is defended by the Jedi Order, a caste of wise warriors with many psychic powers (telekinesis, prescience ...) that they draw from what they call the Force. But it is part of a duality with a Clear Side (or bright), used by the Jedi, and a Dark Side.