A highlighter pen is a vibrant writing tool designed to emphasize and draw attention to specific text or sections in books, notebooks, or documents. Filled with translucent, quick-drying ink, highlighters come in a variety of bright colors—most commonly yellow, pink, orange, green, and blue—that make important information stand out without obscuring the original content. The chisel tip allows for both broad strokes and fine underlining, making it versatile for students, professionals, and anyone who needs to organize or revise content. Highlighters are often used for studying, note-taking, and office work, helping to enhance focus and memory retention.