The Galaxy S21 Ultra supports the S Pen stylus, so you can draw and write on the screen. We tried it out and while it's good, it's no Note challenger.
The S Pen stylus support on Galaxy S21 Ultra: features, price, compatible cases - PhoneArena
How Samsung's S Pen works with its new Galaxy S21 Ultra - The Verge
Samsung Galaxy S21 Ultra: Does it need the S-Pen?
Galaxy Note 10+ owners: Is the Galaxy S21 Ultra a good replacement? - SamMobile
Newest Samsung Galaxy S21 5G leak details storage options, new S Pen cases - PhoneArena
Here is why the Samsung S Pen is a success with tablets and not with smartphones - Good e-Reader
No, This Galaxy S21 Ultra Case Won't Kill The Galaxy Note
Enjoy S Pen Writing Experience with Galaxy S21 Ultra
S Pen Pro Delivered Today (To use with my S21 Ultra and Galaxy Book Pro 360) : r/GalaxyBook