Service Mesh is very new, hot concept and tech in today's cloud native. In this topic, I am going to introduce what is the service mesh, how we do that, in Istio and Envoy case. Also which are the additional values comparing with traditional RPC framework, like Spring Cloud. Especially in observability field, how and what the service mesh could power it. As the Apache SkyWalking creator, I will use SkyWalking to demonstrate the cool visualization of showing metrics and tracing in service mesh. All of these, Istio, Envoy and SkyWalking, are all open source and hosted in Google, CNCF and Apache, which are super friendly to any user.