An index file is a compact organizational tool used to categorize and store a collection of documents or papers. Typically consisting of a durable cover and dividers, it allows users to sort and access information quickly and efficiently. Index files often feature tabbed dividers or labeled sections, making it easy to locate specific documents or topics. Whether for personal use, academic purposes, or professional settings, index files offer a convenient way to keep important papers organized and readily available, helping streamline workflows and improve productivity.