A pen is a common writing tool that uses ink to create marks on paper. It typically consists of a cylindrical body, a nib or ballpoint, and a cap or retractable mechanism. Pens come in various types, including ballpoint pens, gel pens, and fountain pens, each offering a different writing experience. They are essential for students, professionals, and anyone who enjoys jotting down thoughts or ideas. Pens are not just practical; they can also be stylish and personal. Many people choose pens that reflect their personality, such as colorful ink pens or elegant designer pens. Some even collect vintage pens as a hobby, appreciating their craftsmanship and history.