What do the ingredients in a cosmetic do?

The functions of the ingredients in a cosmetic are as follows:

• They moisturize, using humectant and emollient ingredients.
• They bind, holding other ingredients together.
• They emulsify, blending oil and water substances together in a
         smooth formula.
• They thicken or smooth, making a formula richer or able to glide on
         more easily.
• They preserve, preventing the product from deteriorating, and
         harboring bacteria.
• They adjust the pH balance, acting as a buffer to stabilize acids and
         bases.

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