What does "BDSM" mean?
Bondage - partial or complete deprivation of a partner's physical mobility. The term is often confused with rope bondage, which is just one form of bondage.
Discipline is the general name of methods aimed at disciplinary education and training of a partner.
Domination and submission is a set of behavior formats, rules, customs and practices that imply the transfer of power over oneself from the lower partner to the upper one.
Sadism and masochism are practices characterized by painful effects, both physical and psychological.
Sadism is the pleasure of inflicting pain on a partner - physical and psychological.
Masochism is the enjoyment of pain, both physical and psychological.