What is the primary function of a conditioner?

The primary function of a conditioner is to moisturize and protect the hair. Conditioners are formulated with ingredients that help retain moisture, smooth the hair cuticle, and reduce frizz, making hair more manageable. By adding hydration, conditioners improve the overall health of the hair, making it softer, shinier, and less prone to breakage. This protective aspect is especially important after using shampoos, which can strip natural oils from the hair, leading to dryness.

While other answers touch on aspects related to hair care, they do not serve the primary role of a conditioner. Adding color is the function of hair dye, cleansing the scalp relates to shampoo, and styling the hair involves products like gels or mousses, which provide hold and shape but do not moisturize or protect in the same manner as conditioners.