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When you create an inbound security group rule you need to specify where the originating traffic is allowed is from. This could be an IP address, subnet, CIDR block, prefix list, or a security group. When you specify self = true, you are saying the originating traffic must come from some resource with that same security group applied. For example, an EC2 instance with that security group assigned would be able to reach another EC2 instance with that same security group.
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