Israel? what is the role of satan according the judaism?

is Satan a bad force created by God who makes the people to act bad or what is the role of Satan and what is the difference with Azazel or something like that..there is a spirit in the books of the moses that there was a spirit who the Israelites offer a sacrifice why? one for God and one for Azazel who is Satan? in conclusion what is the role of Satan in Judaism?

For Jews, anything that even remotely conflicts with the idea that God is One and Indivisible will be rejected because it precludes true, pure, monotheism. The idea that there is a God in heaven above who fights against a god of the underworld, or hell, is not monotheism. Other faiths had this same duality.

The Satan is described in only a few places in the Hebrew Scriptures. In every instance, he is an angel who works FOR God, not against God, and must get permission from God for everything that he does. Chronicles, Job, Psalms, and Zechariah are the only places where The Satan is mentioned. In each instance, the job description of The Satan is to act like what we now call a Prosecuting Attorney, or District Attorney, and accuse and show evidence against the defendant. Furthermore, like a D.A., The Satan must obtain permission from God, The Judge, to begin a sting operation.

In the Bible there is also verses which show that it is God, the Creator and Ruler of the whole universe, who is responsible for both the Good and the Bad, and not a devil or god of the underworld:

I am the Eternal, and there is none else, there is no god beside me: I girded thee, though thou hast not known me: That they may know from the rising of the sun, and from the west, that there is none beside me. I am the Eternal, and there is none else. I form the light, and create darkness: I make peace, and create evil: I the Eternal do all these things. [Isaiah 45:5-7]

Read on
http://www.whatjewsbelieve.org/explanation7.html

Satan is a non-Jewish concept. It's not dealt with or mentioned in the course of Judaism.

Judaism doesn't teach anything about Satan and Jews in general don't. It's a pure monotheistic religion where there's only one God they believe in, there is no conflict between God and evil. Evil is only a conflict inside humanity.

Satan and Hell are not the concepts of Judaism.

Satan literally means "adversary" or "accuser".
In Judaism, Satan is a creation of G-d whose purpose is to try to get people to sin.
To be specific, he is both the Yetzer Hara (evil inclination), Satan, and Malach HaMaves (angel of death).
In other words, he tries to get people to sin, then accuses them before G-d, and then is sent to punish them.
In Judaism, he is NOT a fallen angel who rebelled against G-d. No angel can do that since angels do not have free will and are created specifically to do a task at the behest of G-d.
Only G-d and man have free will. In fact, the evil inclination is necessary for without it, man would NOT have free will and would do what G-d wants automatically without choosing that path.

The role of Satan is to try people. Something like quality assurance.