Essential oils are volatile substances, which are soluble in alcohol, less soluble in water and consist of a mixture of esters, aldehydes, ketones and terpenes. Essential oils are obtained from aromatic and medicinal plants. To date, 2000 different plants have been identified that produce them. The main methods of obtaining essential oils are distillation (water distillation, steam distillation, etc.), extraction (hot or cold fat, volatile solvents, etc.) and mechanical application (scraping, crushing, etc.).

Most essential oils come from fruits, flowers, shrubs and trees. Indicative aromatic plants from which essential oils are produced are: lavender, cypress, basil, clove, clove, jasmine, geranium, rosemary, elemi, eucalyptus, thyme, verbena, cedar, cedarwood, citron, cypress.