Step 1: Understanding the Concept:
The skin needs water to remain elastic, soft, and healthy.
Step 3: Detailed Explanation:
- The primary function of a moisturizer is hydration.
- It works by trapping moisture in the skin (occlusives) or drawing moisture from the air/deeper layers to the surface (humectants).
- This prevents dryness and maintains the skin barrier.
Step 4: Final Answer:
The role of a moisturizer is Hydration.