This five chapter book reviews boron properties and its applications: Presents various aspects of physiological role of boron in plants. Explore the importance of boron for living organisms, boron toxicity in these organisms, the microbial diversity in environments containing boron, and the applications of boron and boron-containing compounds. Boron is an essential nutrient element for plants. This study reviews the bioremediation of boron contaminated sites by bacteria related with the accumulation of boron. This work addresses the reactive features of boron and the formation of special structures before examining the fundamental chemistry behind Boron-organo-silicone oxide polymers along with the effects of additives during synthesis. Finally, boron-silica compounds with and without magnetic content are characterized using various methods. Based on the resulting properties, interesting potential applications are discussed.