Chloride compounds are chemical substances that contain chlorine and another element, typically a metal or a non-metal. They are commonly found in nature and can be in solid, liquid, or gas forms. Examples include sodium chloride (table salt) and calcium chloride, which are used in various applications, from food preservation to de-icing roads. These compounds play essential roles in many industrial processes and biological functions. For instance, chloride ions are vital for maintaining fluid balance in living organisms. Additionally, chloride compounds are used in the production of chlorine gas, which is important for water treatment and sanitation.