istio.io/content/help/glossary/service-registry.md

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title: Service Registry
---
Istio maintains an internal service registry containing the set of [services](#service),
and their corresponding [service endpoints](#service-endpoint), running in a service mesh.
Istio uses the service registry to generate [Envoy](#envoy) configuration.
Istio does not provide [service discovery](https://en.wikipedia.org/wiki/Service_discovery),
although most services are automatically added to the registry by Pilot
adapters that reflect the discovered services of the underlying platform (k8s/consul/plain DNS).
Additional services can also be registered manually using a
[`ServiceEntry`](/docs/concepts/traffic-management/#service-entries) configuration.