Halide compounds are chemical substances formed when halogens, such as fluorine, chlorine, bromine, or iodine, react with other elements, typically metals. These compounds often consist of a halogen atom bonded to a more electropositive element, resulting in ionic or covalent bonds. Common examples include sodium chloride (table salt) and calcium fluoride. Halides can be found in various forms, including solids, liquids, and gases, depending on their composition and temperature. They play essential roles in numerous applications, such as in the production of fluorinated gases for refrigeration and in the synthesis of pharmaceuticals and other chemicals.