Elastic Network Interface (ENI) is an elastic network interface bound to CVMs in a VPC, which can be freely migrated among multiple CVMs. ENIs are very helpful in configuring and managing networks and building highly reliable network solutions.
You can bind multiple ENIs to a CVM to implement a high-availability network solution(Only ENIs in the same availability zone can be bound, and the specific number that can be bound is determined by the server specification.). You can also bind multiple private IP addresses to an ENI to deploy a single host with multiple IPs.