A paper clip is a small, metal fastener in the shape of a looped wire with two curved ends. It is commonly used to hold sheets of paper together by sliding it over the edges of the papers and bending the ends inward to secure them. The paper clip's simple design and functionality have made it a ubiquitous tool in offices, schools, and households worldwide. Its compact size and ease of use make it a practical solution for organizing and keeping documents in order.