Bondage, discipline, dominance, and submission.
The terms sadism and masochism are derived from the names of Marquis de Sade and Leopold von Sacher-Masoch, two writers who both love and advocate sadomasochism in their writings.
If you ask a person about the definition of BDSM, I think most people know a bit about BDSM and BDSM equipment, and they tend to answer you with sadists and masochists to obtain their sexual pleasure through sadomasochism and BDSM toys.
In short, Sadomasochism (BDSM) is a kind of relationship mode in which the parties obtain sexual pleasure through a series of Sadomasochism activities. Its basic principles (SSC principles) include safety, sane and informed consent, even with most horrible BDSM toys.
Generally, there is at least one S(dominator, abuser) and one M (follower, masochist) in this relationship model using BDSM toys. The specific sadistic activities include binding, verbal humiliation, public training, SP (spanking), wax dripping, and so on, mainly focusing on the three dimensions of binding, domination, and abuse. In the process of training with BDSM toys, S seems to occupy the dominant position, but in fact, M is in charge of the whole situation - everything is based on M's acceptance of those kinky sex toy, and the training behavior can not exceed M's tolerance of BDSM toys.
Everyone could search ‘BDSM’ on Google to find out the official definition on Wikipedia, and BDSM is a variety of often erotic activities or role playing involving bondage, discipline, dominance and submission, sadomasochism, and other interpersonal dynamics with BDSM toys.
What is BDSM and BDSM equipment? Sohimi would divide these four letters like BD -- Bondage & Discipline, DS -- Domination & Submission, SM -- Sadism & Masochism. BDSM usually happens between two people in a personal way and one is called DOM/top, who is dominant and in control of the procedure to use BDSM toys on the Sub, and the other one is Sub/bottom, who is submissive and is the follower of DOM, who tolerate or enjoy those kinky sex toy.
BDSM may include cross-dressers, body modification enthusiasts, rubber fetishists, and animal role players, and so on. BDSM is an umbrella term for erotic behavior between consenting adults. The difference between BDSM and crime of abuse is the rule of SSC(safe, sane, and consensual). For example, if Sub says a safe word like “not this way”, and the DOM should pause action right away. Unlike sexual abuse, BDSM and BDSM equipment is enjoyable for both parties.
In conclusion, I would say BDSM is as simple as an adults' sex game with some brutal but safe procedure.
As for BDSM equipment, you can use rope as BDSM equipment to bond your partner or be bonded. There are arm binders, anal hook, ball lock, bondage cuffs, bondage mittens, bondage harness, bondage belt, bondage belt, bondage hood, bondage tape, breast binder, chain, cock ring, collar, corset, elbow harness, humbler, mouth gags, dildo gags, shackles, sleep sacks, speculum, stocks, gay BDSM toy, BDSM sets, paddles BDSM, bed restraints for sex, whip bondage and so on.