Most massage treatments will relax you, among other things. With a relaxation massage, relaxing you is the only aim. For this reason, it is one of the most complete and indulgent massages you can have.
Definitions vary, but in the UK, a relaxation massage is usually a full-body treatment involving soft music, soft lighting and aromatherapy essential oils. You will have a long, luxurious massage which will use all kinds of massage techniques including long strokes, gentle kneading and rolling of skin and muscle, and perhaps some rhythmic rocking from side to side. It is a passive treatment. You probably won't be stretched or maneuvered into any yoga-like positions, as you are, for example, in
Thai Massage. You just lie there and take it.
This is the massage to choose if you just want to chill out, and be pampered and spoiled.