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+# Elastic Netowrk Interfaces (ENI)
+
+https://aws.amazon.com/blogs/aws/new-elastic-network-interfaces-in-the-virtual-private-cloud/
+
+ENIs are a virtual network card that give EC2 instances network access.
+
+Each ENI can have:
+
+1. a private iPV4 (or more)
+2. one elastic IPv4
+3. one public IPv4
+4. security groups
+5. a MAC address
+
+They are AZ bound and can be moved to other EC2 instances. 
+
+>  Network cards are a hardware component that allow computers to connect to networks
+> ENIs are outside of the EC2 instance, although they affect them they just aren't shared by the instance
+
+Each EC2 instance has one network interface.
+
+Moving an ENI between instances allows for quick failover.