Pair programming is two developers working together on the same code at one workstation, one writing while the other reviews in real time. Teams that practise it consistently rate it among the strongest reasons to be co-located.
It has specific workspace needs a standard hot desk fails: wide desks, dual input, screens both can see, and side-by-side seating without a divider. Marking pairing stations as their own bookable desk type stops them being claimed as ordinary singles by whoever arrives first.