When you launch an EC2 instance, you recieve a Public IP address by which that instance is reachable.
Once you stop that instance and restart the you get a new Public IP for the same instance’s.
So, Public IP get’s changed everytime for an instance after stop/start.
To overcome with this problem, we attach an Elastic IP to an Instance which doesn’t change after you stop / start the instance as many times.
Advantage of Having Elastic IP
-> It is kind of static IP for your Instance.
-> Doesn’t change after stop/start.
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