What is Essential Oil? How it is differnt from Extract?

Essential oils have come into prominence with the spreading awareness about aromatherapy. The first memory of essential oil for an average Indian would probably be the much coveted tinted miniature bottle displayed by beauty salons, spas, aroma therapy centers and home décor stores. They has exotic names such as lemon grass, ylang ylang, tea tree etc… terms that were not in regular use at Indian households. In the words of the experts, these essential oils…

"What is Essential Oil? How it is differnt from Extract?"