A pen is a versatile instrument designed for writing or drawing with ink. It typically consists of a pointed metal nib or a smooth ballpoint tip, which allows for precise lines and fluid strokes. The ink flows through the nib or tip and is contained within a cylindrical holder of various materials such as durable plastic or elegant metal. Many pens also have additional features, such as ergonomic grips for comfort during extended use or retractable mechanisms for convenience. Whether used for everyday note-taking, sketching intricate designs, or signing important documents, a pen is essential for personal expression and communication.