Fine grain wood refers to types of wood with very small, closely spaced lines in the wood, also known as a smooth grain. This natural occurrence is due to the uniformity of the cellulose fibers in the tree. After sanding, fine grain woods become extremely smooth and have fewer knots, as well as less density variation within a single piece. These characteristics make fine grain woods easier to work with, reducing the need for fillers and wood plugs. However, because the grain is small and tight, it may not provide the same level of color contrast as more distinct grains. To enhance the variations in the pattern, stains and finishes can be applied. Nonetheless, many homeowners prefer woods with more prominent variations between the light and dark lines of the grain. In certain cases, fine grain lumber may be covered with an aesthetically impressive veneer to improve the appearance of cabinets, furniture, or floors.