Coil-bound refers to a method of binding pages together using a continuous spiral of plastic or metal wire. This technique allows the pages to lay flat when open, making it easy to write or read without the book closing on itself. Coil-bound books are commonly used for notebooks, planners, and manuals. The coil binding process involves punching holes along the edge of the pages and threading the coil through these holes. This type of binding is durable and flexible, accommodating various page counts and sizes. It is popular in both educational and professional settings for its practicality and ease of use.