The Pen Tool is a versatile graphic design tool commonly found in software like Adobe Illustrator and Photoshop. It allows users to create precise paths and shapes by placing anchor points and adjusting their curves. This tool is essential for creating detailed illustrations, logos, and complex designs. Using the Pen Tool involves clicking to create straight lines and dragging to form curves. Designers can manipulate the paths by adding, deleting, or moving anchor points, giving them control over the shape and flow of their artwork. Mastery of the Pen Tool is crucial for achieving professional-quality designs.