IP allotment for EC2 Instance in AWS

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Is there a need to have elastic ip whenever I create a EC2 instance? Can someone help me with the IP allotment in EC2?
Jan 23 in AWS by Anjali
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No, you don't need an Elastic IP address for all your instances. By default every instance is assigned a private IP and a IP for accessing the internet. The private IP address remains associated with the network interface when the instance is stopped and restarted, and is released when the instance is terminated. The public address is associated exclusively with the instance until it is stopped, terminated or replaced with an Elastic IP address. These IP addresses should be adequate for many applications where you do not need a long lived internet routing end point. Example of places where you need elastic IP are Compute clusters, web crawling, and backend services.

answered Jan 24 by ritwik

Then under what circumstances do we need to use "elastic ip"?

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