A ballpoint pen is a writing instrument that uses a small rotating ball at its tip to dispense ink. The ink is oil-based, which allows for smooth writing and quick drying. Ballpoint pens are popular for everyday use due to their reliability and convenience. Invented in the 1930s by László Bíró, the ballpoint pen replaced fountain pens and quills, making writing easier and less messy. They come in various colors and styles, and many are designed for refillable use, making them an eco-friendly option. Ballpoint pens are widely used in schools, offices, and homes.