Chlorides are chemical compounds that consist of chlorine and another element, typically a metal. They are formed when chlorine, a reactive gas, combines with elements like sodium or potassium. Common examples include sodium chloride, known as table salt, and calcium chloride, often used for de-icing roads. Chlorides are important in various industrial processes and play a role in biological systems. In nature, chlorides are found in seawater and mineral deposits. They are essential for many living organisms, as they help maintain fluid balance and support nerve function. However, excessive chloride levels can lead to environmental issues, such as water pollution and soil degradation.