A service mesh is an infrastructure layer that moves service-to-service networking concerns (mutual TLS, retries, timeouts, traffic routing, telemetry, authorization) out of your application code and into a fleet of...
A sidecar is a helper container that is deployed and scaled together with your application container, in the same pod (Kubernetes) or the same replica (Azure Container Apps).
A Service Deployment Platform is an orchestrator (in practice, usually Kubernetes) that takes a declared desired state, such as "run 3 copies of the Claims API at version 2.4", and continuously makes reality match it.
Serverless deployment means you ship only your code and its triggers (an HTTP call, a queue message, a timer) and let the cloud platform decide where it runs, how many copies run, and when they are switched off.
Multiple Services per Host means running several independently built and versioned services on the same server (VM, App Service plan, or physical machine) instead of giving each its own VM or container host.
Summary: "Service per VM" means every microservice runs on its own dedicated virtual machine (or its own small group of identical VMs behind a load balancer).
