Even those who don't believe in the Force can unconsciously manipulate it—and be manipulated by it. They may not be truly "sensitive" to its flow, but they still call upon the Force without even realizing it. These people seem to have an almost unnatural ability to accomplish their objectives, whether their intent is good, evil, or somewhere in between. The skeptical call it luck. The unbelievers may call it destiny or fate. It is the Force.
(In game terms, the use of Character Points represents very small, almost subconscious manifestations of the Force. The use of Force Points represents more powerful and deliberate use of the Force.)
The most prominent and well-known Force-users in the galaxy are the Jedi. However, the Jedi are not the only ones who have learned to manipulate the Force. Other Force-users sometimes attribute their abilities to sources other than the Force, such as magic or gods, but they are all using the energy to manipulate the world around them.
In game terms, anyone who is Force Sensitive has the ability to learn Force powers, though many of these beings will never go down this particular path.
Other Force-using traditions include dark side cults (such as the Sith), and obscure, isolated sects such as the Witches of Dathomir and the Sorcerers of Tund. Some know the Force for what it is but approach its use in a different way from the Jedi. Others know the Force by a different name. Either way, it remains the mystic energy that binds the galaxy together and gives Force-users their powers.
Source: REUP:147