Aromatherapy is the use of essential oils to enhance the well-being of humans and animals.

Semiochemicals are chemical substances produced, released and received in plants and animals, creating a chemical language used to communicate to each other.
Semiochemicals are detected by the vomeronasal organ (VNO). The VNO, or Jacobson’s organs is an olfactory sense organ used by many animals such as snakes, lizards, and mammals such as mice, rats, cats, dogs, pigs, elephants, and possible humans.

Kairomones are chemical messages between different species that benefit the receiver and not the sender.

Chemical communication is a language made up of chemicals that plants and animals use to speak to each other. This language can take the form of pheromones, allomones, and kairomones, and the chemical messages are processed by the olfactory systems of nearly all animals.

Pheromones are chemical messages between the same species.

Allomones are chemical messages between different species that benefit the sender through deceit.

An essential oil is a hydrophobic (not water loving) liquid containing volatile (vaporizing) aromatic (fragrant) compounds from plants. These oils are extracted from plant parts (e.g. seeds, roots, leaves, fruit skin, and flowers), mostly by steam distillation. Essential oils are used in aromatherapy, ethnomedicine, perfumes, cosmetics, and in commercially flavored food.

Medicinal plants have been used for centuries in healing practices. These plants contain chemical compounds that function in altering biological functions. Many of the pharmaceuticals used in Western medicine are derived from, or synthesized from compounds found in medicinal plants.