Help understanding jicofo vs video-bridge

I see that there are 2 components that make the system work. jicofo is xmpp and used for signaling, and video-bridge for media. What parts of the Jitsi Meet functionality are enabled by jicofo specifically vs just converting SDP to Colibri and talking to video-bridge directly? Is jicofo mainly used for authentication and managing the video-bridge instances? Or does it provide some additional application functionality that is required for calls to work properly

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