Since the different varieties of BDSM overlap, a mutually exclusive and exhaustive classification system is not very useful. Instead an overview of different types of control allows you to express your wants and needs (and meh’s and do-not-want’s) more clearly with your partner.
Physical Control.
Bondage is the most obvious form of physical control because it restrains the bottom, thus limiting their physical freedom. Of course, physical control is not only about restraining limbs. It can involve confinement, such as keeping someone prisoner in a dungeon or locking a person on a human-size birdcage. It can involve physically overpowering someone without restraints and instead pinning them down with your forearms or using your body weight to keep them off balance. It may involve having a third person stand guard at the doorway in case the bottom flees.
The essence of physical control is that the bottom is not necessarily playing along with the scenario. He or she can resist. The bottom may struggle against restraints, or try to flee the cage, or fight back in a simulated abduction all as part of the escapist arousal process that lends to the sensation of being overpowered by a stronger force—but not necessarily outsmarted by a superior intellect.