A Question analyzed and answered by Nathan the Hutt
force (fourse) n.
The force is what gives a Jedi his (or her) power. It's an energy field created by all living things. It surrounds us. It penetrates us. It binds the galaxy together.
More about the "Force". . .
Like any energy field, the Force can be manipulated. Knowledge of these manipulation techniques gives the Jedi Knights their power.
The Force can have a strong influence on the weak-minded
There are two sides to the Force: The peace, knowledge, and serenity of the light side, and the anger, fear, and aggression of the dark side. Both sides of the Force are a part of the natural order, life-affirming and destructive.
Through the Force, a Jedi Knight can see far-off places, perform amazing feats, and accomplish what would otherwise be impossible.