What is a criminal prosecutor?

In the United States, a criminal prosecutor is a representative of the State or Federal government who's job is to identify individuals who have committed crimes and to prosecute them for this violation. These are the people who will go into the court room and argue to the judge (and or jury) that the defendant has committed a crime and should be held accountable for that offense.

Depending on the state the prosecutors may belong to the Federal government, State, County(or District), or City.