Dip pens are writing instruments that consist of a metal nib attached to a handle. Unlike modern pens, dip pens do not have an internal ink reservoir. Instead, the user must dip the nib into ink before writing, allowing for a variety of line thicknesses and styles depending on the pressure applied. These pens have been used for centuries, dating back to ancient times, and are popular among artists and calligraphers for their versatility. The nib can be changed to achieve different effects, and the use of ink allows for a wide range of colors and textures in writing and drawing.