It&#x27;s &quot;federation-as-a-service&quot;, basically.<p>A common use case is federation between two Slack teams (share a channel).<p>Another common use case is federation between a group in Skype and a channel on Slack.<p>Or IRC and Telegram, etc.<p>Making existing systems work together really well is priority one. API only makes sense once that&#x27;s done.