A "good hair conditioner" is a substantive that refers to a hair care product. It's a hair treatment that's applied to hair after shampooing, left in for a few minutes, and then rinsed out. A good hair conditioner can improve the texture and appearance of hair, making it softer, smoother, and more manageable.
Conditioners have been around for centuries, with early versions made from natural ingredients like vinegar and olive oil. Today, conditioners are typically made with a combination of synthetic and natural ingredients and play a key role in hair care routines.