Essential oils are the concentrated fluids of complex blends of the volatile compounds which can be separated from a few plants organs and they are excellent source of a few bioactive mixes. Jamun is a very commom aromatic plant which is found in many places. Janum (Syzygium cumini) have some properties like antioxidative and antimicrobial etc. Essential oils from jamun can be extracted by various ways but hydrodistillation is considered as the best technique because a good yield can be obtained by this method. Syzygium cumini contains appreciable amounts of polyphenols, ellagic acid, and ellagitannins, in addition to an abundance and diversity of anthocyanins. It is also discuss that it has cancer chemopreventive potential of its bioactive constituents. Because of their antioxidant properties the leaf essential oil from Indian black berry may be used as natural preservative element in the food and some other industries like pharmaceutical industries.