Oil is Oil
Essential oils are concentrated oils extracted from plants and flowers and concentrated to enhance the positive effect that some people feel.
A carrier oil is a base oil that is gentle enough to use on skin. Examples of base oils are Avocado, Sweet Almond, Coconut and Jojoba oil.
These carrier oils are often used to dilute the essential oils (which are too strong to use directly on skin).
The carrier oils themselves contain many useful elements and can nourish skin and hair alone without the aid of an essential oil.