A ballpoint pen is a type of writing instrument that uses a small rotating ball made of brass, steel, or tungsten carbide to transfer ink from the pen's reservoir onto the writing surface. The ball rotates as the pen moves across the surface, allowing the ink to flow evenly and smoothly onto the paper.
Ballpoint pens are popular due to their convenience and versatility. They are easy to use, relatively inexpensive, and can be used on a wide range of surfaces, including paper, cardboard, and some plastics. Ballpoint pens come in a variety of colors and styles, from basic black and blue pens to fancier models with retractable tips, ergonomic grips, and other features.
Ballpoint pens were first invented in the late 19th century, but it wasn't until the mid-20th century that they became widely popular. Today, they are one of the most common types of pens used in everyday life, from school and office work to personal writing and drawing.