How do i know exactly what is aromatherapy?

Aromatherapy: Is a form of alternative medicine that uses volatile plant materials known as essential oils, & other aromatic compounds for the purpose of altering one's mind, moods, cognitive functions & health. Examples of such oils are tea tree which is claimed to have anti-microbial action. Another is lemon oil which enhances mood, lavender as antiseptic, & sage oil to boost memory.