A highlighter is a special pen used to mark important text in bright colors, making it easier to find key information later. Students often use highlighters when studying, as they help emphasize important points in books, notes, or documents. The vibrant colors can make learning more engaging and visually appealing. Highlighters come in various colors, such as yellow, pink, and green, allowing users to color-code their notes. Many people also use them in professional settings to highlight essential details in reports or presentations. Overall, a highlighter is a simple yet effective tool for organizing and retaining information.