Marker pens are writing instruments that use a felt tip and are filled with ink, typically water-based or permanent. They come in various colors and tip sizes, making them versatile for different tasks such as drawing, labeling, and crafting. Marker pens are popular in schools, offices, and art studios due to their ease of use and vibrant colors. These pens can be categorized into several types, including permanent markers, dry-erase markers, and highlighters. Each type serves a specific purpose; for example, permanent markers are used for long-lasting marks, while dry-erase markers are designed for use on whiteboards.