Chromated Copper Arsenate (CCA) is a chemical wood preservative that combines copper, chromium, and arsenic. It is primarily used to protect wood from decay, insects, and other environmental factors. CCA-treated wood is commonly found in outdoor structures like decks, fences, and playgrounds due to its durability. The use of CCA has raised health and environmental concerns because of the toxicity of arsenic. As a result, many countries have restricted or banned its use in residential applications. Alternatives to CCA, such as pressure-treated wood with safer preservatives, are now more widely recommended for consumer use.