A pencil is a tool for writing or drawing. It has a long body, usually made of wood. Inside the wood, there is a thin stick. This stick is called graphite. Graphite is not lead. It is a type of carbon. When you write, the graphite leaves a black mark on the paper. Many pencils have an eraser on one end. The eraser is small and made of rubber. You can use the eraser to remove the marks. Pencils do not use ink. They are simple tools for school or work.