You can take notes or make sketches on your reMarkable with a reMarkable stylus. With the stylus, your notes and sketches are neat and accurate. You have to replace the pen tips of your stylus have regular use. You can do so with separate pen tips or with the pen tips that are included with the stylus. Some styli have an eraser function, which allows you to erase notes or sketches with the back of the stylus. You can magnetically attach the stylus to the side of your reMarkable, so you don't lose it quickly.