# Connections
Understand how trust and routing relationships are established across organisations and systems.

| Concept | What it explains |
| [Trust registries](/products/affinidi-trust-fabric/agent-gateway/concepts/connections/trust-registry.md) | How the gateway verifies agent credentials against an external trust registry, and how trust registry data is injected into OPA policy evaluation. |
| [Gateways](/products/affinidi-trust-fabric/agent-gateway/concepts/connections/gateways.md) | How gateway instances are identified, how they connect to each other, and how Gateway Connection routes traffic across boundaries. |


## Pages in this section


- [Trust registries](/products/affinidi-trust-fabric/agent-gateway/concepts/connections/trust-registry.md): How the Agent Gateway connects to an external trust registry over DIDComm, and how it injects and verifies trust metadata on inbound requests.

- [Gateways](/products/affinidi-trust-fabric/agent-gateway/concepts/connections/gateways.md): How Agent Gateway instances are identified, how they connect over encrypted DIDComm tunnels, and how connection points enable secure multi-hop routing across organizational boundaries.