A photocopier is a machine that makes copies of documents and images. It works by using light to scan the original document, which is then reproduced onto paper. Photocopiers can produce multiple copies quickly and are commonly found in offices, schools, and libraries. Modern photocopiers often have additional features, such as scanning, faxing, and printing. They can handle various paper sizes and types, making them versatile tools for both personal and professional use. Many photocopiers also include digital interfaces for easier operation and connectivity to computers and networks.