What is a default Security Group in AWS? (64/285 technotes for 2015)

• If an instance is created without specifying a Security Group, a default Security Group for the VPC will be automatically associated to the instance
  
• Rules
• Specifies itself as a source Security Group, This is what allows Inbound traffic only from other instances associated with the default Security Group.
• Allow all outbound traffic from this instance.
• You cant delete a default security group.