It is a practice in which one person voluntarily gives up his or her control to another for the purpose of mutual enjoyment.
Some individuals use D/s only as a sexual role-play, while others may live out a D/s relationship dynamic 24/7.
D/s is first and foremost a psychological structure, though it can also involve physical acts. It is common in the BDSM community and can be combined with other aspects of kink and fetish, or not. I'm a D/s specialist and I integrate it heavily into most of my sessions as well as my personal practice. Ultimately I seek a profound and life-changing style of power exchange that creates positive transformation in both Dom/me and sub. The ultimate goal of D/s is not to punish, but to help make the sub a better human being.