Hydrogen fluoride (HF) is a colorless gas or liquid that is highly corrosive and toxic. It is composed of hydrogen and fluorine atoms and is commonly used in various industrial applications, such as glass etching and metal cleaning. When dissolved in water, it forms hydrofluoric acid, which can cause severe burns and damage to tissues. Due to its hazardous nature, hydrogen fluoride must be handled with extreme care. It can easily penetrate skin and mucous membranes, leading to serious health risks. Proper safety equipment and protocols are essential when working with hydrogen fluoride to prevent accidents and exposure.