Highlighter pens are writing instruments designed to emphasize text by using bright, translucent ink. They come in various colors, such as yellow, pink, and green, allowing users to highlight important information in books, notes, or documents. The ink is typically water-based, making it easy to apply and quick to dry. These pens are commonly used by students, professionals, and anyone who needs to organize information effectively. Highlighters can help improve reading comprehension and retention by drawing attention to key points. They are often used in conjunction with other stationery items like ballpoint pens and notebooks for effective study and organization.