A stylus pen is a small, pen-like tool used to interact with touchscreens on devices like tablets and smartphones. It allows for more precise control than using fingers, making it easier to draw, write, or navigate apps. Many stylus pens are designed to mimic the feel of traditional writing instruments, providing a comfortable grip for users. Stylus pens come in various types, including capacitive and active styluses. Capacitive styluses work with any touchscreen, while active styluses often have additional features like pressure sensitivity and palm rejection, making them ideal for artists and note-takers.