What is the primary purpose of using a leave-in conditioner?

The primary purpose of using a leave-in conditioner is to add extra moisture and protection to the hair. Leave-in conditioners are formulated to hydrate hair strands and can help in smoothening them, making them more manageable, reducing frizz, and preventing damage from environmental factors such as heat and humidity. The moisture added by these products is essential for maintaining the health of the hair, especially for those with dry, curly, or chemically treated hair types.

In addition to moisture, leave-in conditioners can provide a barrier against tools and techniques that could cause thermal damage, thus acting as a protectant while styling. These benefits are key for individuals seeking to maintain healthy hair and enhance its appearance. Other options such as cleansing the scalp, styling, or adding volume serve different primary purposes and do not align with the main functionality of a leave-in conditioner.