They allow the hair to be soft to the touch and well hydrated.
It is applied from the middle to the ends of the hair, once detanging and remove knots is done, just rinse thoroughly with water.
Also known as conditioner without rinsing, it is usually applied after rinsing with very wet hair, so it can trap water molecules and leave hair hydrated. Its formulation can be richer thanks to oils and emollients or lighter thanks to moisturizers. It does not need rinsing.