In a BDSM context, a collar is a device of any material worn by a person around the neck to indicate their submissive or slave status in a BDSM relationship.

Steel collars are also worn by some and lockable (metal) necklaces are also regarded as a form of collar.

A very few even choose to wear permanently locking collars (these click into place and have no unlocking key), that cannot be removed except by cutting the steel.

It is often combined with a traditional corset in order to achieve better posture.

Collars have varying degrees of significance for people in the BDSM community.

Such items are often referred to as everyday collars in BDSM parlance.

Further evolution of this migration has had groups which actively practice BDSM in a relationship but where roles are switched or not as clear as in a traditional D/s relationship.

It may also be a potently tangible symbol of the relationship itself or of the ownership the submissive is held in.

A lockable collar may further symbolize a transfer of power from the submissive to the dominant holding the key.

Collars often feature buckles, straps and hooks, padlocks and other attachments.