Wood carving is a kind of sculpture, which is often called "folk craft" in China. Wood carving can be divided into three categories: three-dimensional round carving, root carving and relief carving. Wood carving is a kind of work separated from carpentry, which is classified as "joinery" in China. Folk art varieties classified by carving materials. Generally, nanmu, rosewood, camphor, cypress, ginkgo, agarwood, mahogany, longan and other excellent and tough tree species are selected. The natural art of tree root carving is "tree root carving". Wood carving includes round carving, relief, carving or a combination of several techniques. Some people also paint to protect wood and beautify it.