Aromatic plants possess odorous volatilesubstances which occur as essential oil, gum exudate, balsam and oleoresin inone or more parts, namely, root, wood, bark, stem, foliage, flower seed andfruit. The characteristic aroma is due to a variety of complex chemicalcompounds. The term essential oil is similar to fragrance or perfumes because thesefragrances are oily in nature and they represent the essence or the activeconstituents of the plants. Essential oils and aroma chemicals constitute amajor group of industrial products.
These plant materials continue to play positiveroles in human life, as sources of modern pharmaceuticals to treat medicalproblems, as herbs and spices to tempt the palate, and in a multitude of otherapplications. Demand and trade for these plant materials initiated globalizationthat spread new ideas and new settlements along with native resentment.