More advanced, good for HPC (Hight Performance Computing) , MPI and ML use cases.
Useful for applications that are tightly coupled, have a lot of interconnectivity between components of the application, that require very low latency, and are therefore also close to each other (see above)
It can be used with all instance types.
ENI and EIP (Elastic IP Address) can be remapped to a different instance within the same Subnet.