Boron trifluoride (BF₃) is a colorless gas at room temperature and is known for its strong Lewis acid properties. It consists of one boron atom bonded to three fluorine atoms. BF₃ is commonly used in organic chemistry as a catalyst in various reactions, particularly in the formation of complex molecules. Due to its reactivity, boron trifluoride can form adducts with other compounds, enhancing their reactivity. It is also utilized in the production of certain materials and in the semiconductor industry. However, BF₃ is toxic and should be handled with care to avoid exposure to its harmful effects.