what's relay and how to disable the connection to outside

Could you tell me what’s the usage of relay? what i want to do is using syncthing to setup a homelab environment for all my devices. but after setup, the syncthing has the connect to outside( Joined relay relay:// ). Is it possible to disable such feature?

version: syncthing v0.14.26 “Dysprosium Dragonfly” (go1.8 darwin-amd64) jenkins@build.syncthing.net 2017-03-23 11:04:35 UTC

Check the docs

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