The primary use of a pencil is for writing or drawing. A pencil consists of a core made of a mixture of graphite and clay, enclosed in a wooden or plastic casing. When the pencil tip comes into contact with paper, the graphite leaves a mark, allowing users to create letters, numbers, or illustrations. Pencils are favored for their ease of use, portability, and erasability; they can be sharpened to maintain a fine point. They are commonly used in schools, offices, and art settings due to their versatility and low cost. Some pencils are also designed for specific purposes, such as coloring or sketching.