A book light is a small, portable light designed to illuminate the pages of a book, making it easier to read in low-light conditions. These lights often come with adjustable brightness settings and flexible necks, allowing users to direct the light exactly where they need it. They can be powered by batteries or USB, making them convenient for both home and travel use. Many book lights are lightweight and clip onto the book, ensuring they stay in place while reading. Some models even feature rechargeable batteries, which eliminate the need for constant battery replacements. Overall, a book light is a practical tool for avid readers who enjoy reading at night or in dimly lit spaces.