On the basis of gravity:
1. Felonies :
The more serious crimes are called felonies and are usually punished by death, forfeiture of property or rigorous imprisonment.
2. Misdemeanors : The less serious are called misdemeanors and are usually punished by fines or simple imprisonment.A person commits a felony is called a felon and who commits misdemeanor is called misdemeanant. It is very difficult to assume that felons are more dangerous and respond less positively to rehabilitative measures than misdemeanants. Sometimes a person can commit felony this week and commits a misdemeanor in second week