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 styles and materials, from simple plastic designs to luxurious gold or silver models. Many people enjoy using fountain pens for their elegance and the ability to customize the ink color and nib size, enhancing the overall writing experience.