A marker is a writing tool that uses ink to create bold, visible lines on various surfaces. They come in different types, such as permanent, dry-erase, and highlighters, each designed for specific purposes. For example, a highlighter is used to emphasize important text, while a permanent marker is ideal for labeling items that need to last. Markers are popular in schools, offices, and homes because they are easy to use and come in a variety of colors. Artists also use markers for drawing and coloring, as they can produce vibrant and detailed artwork. Overall, markers are versatile tools that enhance creativity and communication.