Amazon Web Services (AWS) Security Groups are a way to control inbound and outbound traffic to your Elastic Compute Cloud (EC2) instances. They act as a virtual firewall for your instances, and provide an additional layer of security for your resources in the AWS cloud.
Here are some key features of AWS Security Groups:
- Stateful: Security groups automatically track the state of connections and only allow traffic that is part of an established connection.
- Inbound and outbound rules: Security groups can have rules for both inbound and outbound traffic, allowing you to control traffic in both directions.
- Multiple security groups: An EC2 instance can belong to multiple security groups, allowing you to apply different sets of rules to different instances.
- Allow and deny rules: Security groups can have both allow and deny rules, giving you fine-grained control over the traffic that is allowed to reach your instances.
- Source and destination: Rules can be defined based on the source and destination of the traffic, allowing you to control traffic based on the IP address or security group.
- Easy to manage: Security groups can be easily managed through the AWS Management Console, the AWS Command Line Interface (CLI), or the AWS SDKs.
AWS Security groups are an important aspect of security in AWS, it acts as a virtual firewall for your EC2 instances. It allows you to control both inbound and outbound traffic to your instances, it’s stateful, allows multiple security groups to be associated with an instance and easy to manage. It is also possible to define rules based on the source and destination of the traffic.