Definition: Sopapen is a type of paper that has been used historically in many cultures for writing, printing, and other purposes due to its light weight and ease of manipulation. It was originally made from natural fibers such as cotton or hemp, but modern soppens are made primarily from synthetic materials like polyethylene terephthalate (PET) or recycled polyester. Sopapens are often used in schools for educational purposes, as well as in the home to write and draw on.