What sort of pens are there?

There are several types of pens, including ballpoint pens, which use a viscous ink and a tiny ball bearing to write; fountain pens, which utilize liquid ink and rely on gravity and capillary action; and gel pens, which combine water-based gel ink for smooth writing. Additionally, there are rollerball pens, which offer a fluid writing experience similar to fountain pens but with a ballpoint tip, and felt-tip pens, which have a porous nib for vibrant colors. Each type serves different writing preferences and purposes.