What is the best quality of wood typically found at the center of a tree?

Heartwood is the dense, inner part of a tree trunk that is typically found at the center. It is formed as the tree matures, with the sapwood, which is the outer layer actively involved in the transportation of nutrients and water, eventually becoming heartwood as it ages. Heartwood is usually darker in color and more durable because it has been treated by the tree's natural processes, which often include the deposition of resin and other substances that enhance its resistance to decay and pests. This quality makes heartwood highly sought after for various woodworking and construction applications due to its strength and longevity.

In contrast, sapwood consists of the younger, outer layers of the tree that are still living and actively participate in nutrient transport. Bark is the protective outer covering of the tree, serving a different function, while veneer is a thin layer of wood sliced from a log, typically used for decorative purposes or surface finishes. Thus, heartwood stands out as the best quality wood for its strength and durability.