What is the degrees of murders?

Murder is very serious crime and a law has maintained a proper legal punishments and degrees imposed on the person. In USA there are 4 degrees for this crime i.e. First degree murder, second degree murder, voluntary manslaughter which is scored 3rd degree murder, and involuntary manslaughter. First degree murder is imposed on the person who has done a dangerous crime which resulted in a death, second degree murder charge falls on the person who intentionally is that to murder, voluntary manslaughter arises on the person who resort or death unintentionally like he fires a gun in a crowded place where unintentionally a person lead to a death, lastly UN voluntary Mans laughter also result in an intentional murder.