Wood preservative is a chemical solution applied to wood to protect it from decay, insects, and other forms of damage. These products help extend the lifespan of wooden structures, such as decks, fences, and furniture, by creating a barrier against moisture and pests. There are various types of wood preservatives, including water-based and oil-based formulations. Some common active ingredients include copper, borate, and chromated copper arsenate (CCA). Proper application and maintenance of wood preservatives are essential for ensuring their effectiveness and protecting the wood over time.