Boron is one of the most essential nutrient required by plants. New exciting progress in boron research in the past few years significantly contributed to better understanding of the role of boron in plants and animals. In plants, it is mainly involved in carbohydrate metabolism and cell division. Plants are the main source of Boron for animals as food. Boron has been implicated to function in a variety of metabolic and physiological systems in humans and animals. This review study was done to explain the significant involvement of micronutrient Boron in the lifecycle of living organisms.