Amazon Virtual Private Cloud (Amazon VPC) is more secure because it allows you to create instances in a logically isolated virtual network.
The following screenshot shows few components that are important in the Amazon VPC:
AWS Account supports EC2 instances in VPC only. Now the question can be, do you need to create a VPC the moment you create your account?
The answer is no. Default VPC is available in the Amazon VPC. If you delete default VPC, then you cannot restore it. You need to contact AWS Support.