Why X2 interface are required in handover between eNodeBs?

Hi Experts,
Why X2 interface are required in handover between eNodeBs?

X2 handover is faster as compared to S1.

Automatic neighbour addition, rlf based Ho trigger, less ho timeā€¦ few to mention because of x2

Thank You.
Can you tell what is ho time in case of x2 and S1 both? :pray:

Check meanholdingtime for S1mme.