纸 (zhǐ) is the Chinese word for "paper." It is a thin material made from cellulose fibers, typically derived from wood, rags, or grasses. Paper is widely used for writing, printing, packaging, and various crafts. The invention of paper is attributed to Cai Lun, a Chinese official, in the 2nd century AD, which revolutionized communication and record-keeping. Today, paper comes in many forms, including notebooks, newspapers, and cardboard. It is an essential part of daily life and is used in schools, offices, and homes. The production of paper has evolved, with a focus on sustainability and recycling to reduce environmental impact.