5TH camera lens use?

[Malick17]

Why do s23 ultra has 5 camera cutouts despite having 4 cameras on back. What is the use of 5th cutout. Even it has an IR light which can be seen with camera only. 

[Livealone]

The 5th one is for IR blast while capturing the pic in low light.

[RajathSR]

The 5th cutout is not a camera,
its used for detecting the subject for auto focus
basically, this 5th cutout guides the camera as to where to focus ..each time when you take a photo

[devansh66]

Night shots

[Being_human]

From s21 series onwards samsung using Laser auto focus in ultra models.
Because of large sensor , phase detection auto focus(PDAF) faced focus issues in pictures (S20 ULTRA bacame flop due to this )