What is Federal Rules Of Criminal Procedure?

Legal Definition
The Federal Rules of Criminal Procedure are the procedural rules that govern how federal criminal prosecutions are conducted in United States district courts and the general trial courts of the U.S. government. As such, they are the companion to the Federal Rules of Civil Procedure. The admissibility and use of evidence in criminal proceedings (as well as civil) is governed by the separate Federal Rules of Evidence.
-- Wikipedia
Legal Definition
These are the rules that govern all procedures in the district courts in criminal cases.