Wood is a structural material found in the roots and stems of trees. It is a porous and fibrous substance that is made up of cellulose fibers. The cellulose fibers are strong in tension and embedded in a matrix of lignin that resists compression. When it is pressed, the resulting material will break, but it will not break down. This material is very versatile and can be used for a variety of purposes. The inner structure of the tree determines the color, texture, and behavior of the wood. Hundreds of different species of trees are used for different things, including furniture, building materials, and biofuel. While some wood types are more similar than others, some varieties are more similar than others. The texture of different types of wood will differ, but some common traits are listed below. The following are some examples of wood: hardwoods, softwoods, and plastics. Cypress family trees ֠Unlike other woods, Cypress trees can be harmful to the skin and may cause allergic reactions. The oils and resins from the tree are toxic, which makes them less suitable for contact applications. It is also recommended to use sawdust-free products if possible, and to wear gloves while working with this material. When working with wood, itҳ important to keep in mind that there are some trees that are more prone to skin irritation and allergies than others.