Consent and communication distinguish BDSM from violence.
Deriving pleasure from inflicting sensation or pain. Fifty Shades of Kink: An Introduction to BDSM
I can provide more depth on whichever area interests you most. Consent and communication distinguish BDSM from violence
Use of rules, rewards, and punishments to shape behavior. Dominance and Submission (D/S) Fifty Shades of Kink: An Introduction to BDSM
The original industry standard for safety.
BDSM is an umbrella term covering three distinct but overlapping areas: Bondage and Discipline (B&D) Physical restraint using ropes, cuffs, or fabrics.