A paper clip is a small, simple device used to hold sheets of paper together. Typically made of metal or plastic, it is designed in a looped shape that allows it to grip multiple pages without causing damage. Paper clips come in various sizes and colors, making them a popular choice for organizing documents in offices and schools. The invention of the paper clip is often attributed to Johan Vaaler, a Norwegian inventor, who patented a design in 1899. However, similar designs existed before his patent. Today, paper clips are widely used around the world for their practicality and ease of use.