Spiral binders are a type of binding used to hold together multiple sheets of paper. They consist of a continuous spiral coil that threads through holes punched along the edge of the pages. This design allows the pages to lay flat when opened, making it easy to read and write on both sides. Commonly used in notebooks, reports, and presentations, spiral binders come in various sizes and colors. They are popular in schools and offices due to their durability and flexibility. The binding can accommodate different paper thicknesses, making them suitable for a wide range of documents and projects.