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Propagation
If you move your domain from one host to another, you will receive a new IP address for the domain. The DNS of your new host will be updated with the location of that IP address.
All other DNS Servers in the world then need to be updated with the new location. The DNS Servers of different hosts update at varying intervals - anywhere between 1 hour and 1 week.
The time taken between the initial change being made and all the world's DNS Servers being updated with the new information is called "Propagation".
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