# Nexus services

> Nexus Services are named collections of arbitrary-duration Nexus Operations that provide a microservice contract suitable for sharing across team boundaries.

[Nexus Services](/glossary#nexus-service) are named collections of [Nexus Operations](/nexus/operations) that provide a contract for sharing across team boundaries.
A [Nexus Endpoint](/nexus/endpoints) exposes Services for callers to use.

Services are registered in a Worker that polls the Endpoint's target Task Queue.
Multiple Services can run in the same Worker.
Services typically run alongside the Workflows they abstract, or in a dedicated router Worker using the [router-queue pattern](/nexus/patterns#router-queue-pattern).

Callers reference a Service by name when executing a Nexus Operation.