Wood grain refers to the pattern and texture found on the surface of wood, created by the arrangement of its fibers. This pattern can vary significantly between different types of wood, such as oak, maple, or walnut, and is influenced by factors like the tree's growth conditions and age. The grain can be straight, wavy, or interlocked, affecting both the appearance and strength of the wood. Wood grain is often highlighted in furniture and flooring, where it adds aesthetic appeal and character. Understanding wood grain is essential for woodworking and design, as it impacts both functionality and beauty.