Wood rot is a type of decay that occurs when wood is exposed to moisture and certain fungi. This process breaks down the cellulose and lignin in the wood, leading to structural weakness. There are two main types of wood rot: dry rot, which thrives in dry conditions, and wet rot, which occurs in damp environments. Preventing wood rot involves keeping wood dry and well-ventilated. Regular maintenance, such as sealing and painting, can protect wood from moisture. If wood rot is detected, it is essential to remove the affected areas and replace them to maintain the integrity of structures like decks and furniture.