What is a biro?

A biro, also known as a ballpoint pen, is a 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. It was designed in 1938 by László Bíró and became popular because it was less messy and more reliable than fountain pens. Biro pens come in different colors and tip sizes, and the ink is usually oil-based, but some brands use water-based ink. Biro pens are widely used for everyday writing and are a common sight in offices, schools, and homes.