Mostly laws told what is crime and what is punishment for those crimes. Code of Criminal procedure deals how the punishment will be given. It tolds about the procedure giving punishment step by step and all matters related to them.

It tolds about the creation of Criminal Courts and their powers. It also told about the powers of police - accused persons(s). How a person can be arrested. How a person be compelled to appear or to produce things before lawful authority. The procedure of trial in Courts. It has also provisions for bails and bounds related to accused person.

Code of Criminal Procedure also has provisions of time limitation within which a case is to be filled in the Court. Any case filled after the time limitation cannot be heard by Courts. Courts has given powers to relax time limitation in certain conditions.

This is also one of the main law which one must know.