1. Different functions: A stylus is a thin pen with a nib, which can be used for writing, drawing and operating on touch screen devices. Touch screen pen is a kind of pen with soft nib, which can be used to write and draw on touch screen devices, but it has no operation function.

2. Different usage scenarios: The stylus is used to operate on touch-screen devices such as tablet computers, mobile phones and notebook computers, such as taking notes, drawing and signing on tablet computers. The stylus is used to write and draw on touch screen devices, such as graffiti and painting on tablet computers.