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The basis of a Security Group is a VPC.
Because security groups can be configured for resources running on VPC, you will see descriptions of security groups for various resources such as EC2 and RDS, but these are simply descriptions of the same thing for each AWS resource they apply.
S3 does not have a security group. This is because S3 does not operate within VPC.
I hope this helps your understanding.
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To add to their great answers, Security Groups our AWS's host based firewalls, within the VPC. With different labels, according to the resource their protecting:
https://docs.aws.amazon.com/vpc/latest/userguide/vpc-security-groups.html
answered 2 months ago
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