what is data center? what is on-premises data center ? what is region ?

what is data center?
------------------------
data center is a place where we have infrasture
data center is dedicated to certain person
this data center is maintained by the person
he is the owner of the data center
this is also called as physical data center short form is PDC

aws is also maintaining multiple data centers across the globe
aws is also maintaining multiple PHYSCIAL DATA CENTERSS centers across the globe

on-premises data center
-----------------------------
this is type of data centers are dedicated to particular business owners
ex: suppose if xyz bank or abc bank maintain this type data center.
this is called as sbi on-premises data center
 
region
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region is a location where aws maintaining their physical infrastructure 

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