An essential oil refers to a concentrated hydrophobic liquid made up of volatile chemical compounds found in plants. These oils are typically extracted through a distillation process which is done by using steam. There are also other techniques used to extract essential oils, such as resin tapping, cold pressing, solvent extraction, absolute oil extraction, wax embedding, expression and sfumatura. The oils are utilized in soaps, perfumes, air fresheners, and cosmetics. They are also used for flavoring beverages and foods, making home cleaning goods as well as for adding fragrances to incense. Essential oils are commonly utilized in aromatherapy, which is a type of alternative medicine in which aromatic compounds are considered to have therapeutic benefits. They also have various health impacts such as reducing pain, anxiety and inflammation, and enchaining sleep, decreasing nausea and relieving headaches. This book aims to understand the role of essential oils for health and wellness. Researchers and students studying essential oils will be assisted by it.