Control traffic to your AWS resources using security groups
A security group controls the traffic that is allowed to reach and leave the resources that it is associated with. For example, after you associate a security group with an EC2 instance, it controls the inbound and outbound traffic for the instance.
https://docs.aws.amazon.com/vpc/latest/userguide/vpc-security-groups.html
B. Security groups
Security groups act as virtual firewalls for your Amazon EC2 instances, controlling inbound and outbound traffic. You can configure security groups to allow or deny traffic based on rules that you define. By associating a security group with an EC2 instance, you can control the traffic to and from that instance at the network level.
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