There are many types of lumber, each with its own characteristics and uses. Softwood lumber, derived from coniferous trees such as pine, spruce, and fir, is commonly used for structural purposes due to its strength and cost-effectiveness. Hardwood lumber, which comes from broadleaf trees like oak, maple, and mahogany, is often chosen for its aesthetic appeal and durability. Both brown and green treated lumber are commonly used in outdoor projects, including decks, fences, retaining walls, and landscaping structures. The treatment process significantly improves their resistance to moisture, fungal decay, termites, and other wood-boring insects, making them suitable for applications where the wood is in direct contact with the ground or exposed to weather elements. Lumber is typically classified based on its grade, which denotes its quality and suitability for specific applications. Higher-grade lumber is more uniform, free from defects, and typically used for visible surfaces or premium projects. Lower-grade lumber may have knots, blemishes, or other imperfections and is often used for less visible areas or in applications where structural integrity is the primary concern.