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# Relays

Create and manage a system-wide network relay configuration that uses built-in proxying for TCP and UDP traffic over HTTP/3 and HTTP/2.

## Topics

### Essentials

  <doc://com.apple.documentation/documentation/BundleResources/Entitlements/com.apple.developer.networking.networkextension>

### Relay configuration

[`NERelayManager`](/documentation/NetworkExtension/NERelayManager)

An object you use to create and manage a network relay configuration.

[`NERelay`](/documentation/NetworkExtension/NERelay)

A single relay server configuration that you can chain together with other relays.


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