A pen is a common writing instrument used to apply ink to a surface, typically paper. It consists of a barrel, a nib or ballpoint, and an ink reservoir. Pens come in various types, including ballpoint, fountain, and gel pens, each offering different writing experiences and ink qualities. Pens are widely used in everyday life for tasks such as note-taking, signing documents, and creating art. They are portable and convenient, making them essential tools for students, professionals, and artists alike. The invention of the pen has greatly influenced communication and creativity throughout history.