Intimately related to k8s and microservices

• Is an infra layer to connect services (via application layer (restapi,URLs..). All in the application layer, we don't worry about l1,l2,l3. Network connectivity is abstracted and gave it for granted.
• A set of transparent proxies/sidecars (eg ngnix) intercept all Layer 7 traffic (basically https requests). The proxy is itself a container
• Use cases:
• Load balance traffic. More in the application level than anything.
  • For some part of the world, expose a version of the application, for the other one expose, let's say, the beta version.