Aromatherapy is the study of how essential oils can be used for medicinal purposes.
Henri Gattefosse in France 1928 was the first person to call it Aromatherapy and consider it a science. The story goes he got into the field when while working in the lab he burned his hand. The use of oils and herbs for medicinal purposes has been around for literally thousands of years. Aromatherapy is not only used on humans. It's used on animals and other plants as well.