A fountain pen is a writing instrument that uses a metal nib to deliver ink to paper. Unlike ballpoint pens, which use a rolling ball to dispense ink, fountain pens rely on gravity and capillary action. They can be filled with ink from a bottle or use disposable ink cartridges, making them a popular choice for those who appreciate a smooth writing experience. Fountain pens come in various designs and materials, often featuring elegant finishes and intricate details. Many writers prefer them for their ability to create fine lines and their customizable ink options. Notable brands include Montblanc, Parker, and Lamy.