A ballpoint pen, commonly known as a "biro" or "ballpen," is a writing instrument that uses a small rotating ball at its tip to disperse ink onto the writing surface. It typically consists of a plastic or metal barrel, a retractable mechanism, and a replaceable ink cartridge. The ballpoint pen offers a smooth and consistent writing experience, making it a popular choice for everyday writing tasks. Its versatility, convenience, and durability have made it a staple tool in offices, schools, and households worldwide.