What is the meaning of the "onnegotiationneeded" event in WEBRTC screen sharing?

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The "onnegotiationneeded" event in WEBRTC screen sharing is a signaling event that is triggered when the browser detects that a new ICE candidate is available or when the offer needs to be renegotiated for some reason. This event is used to start a negotiation process between the WebRTC peers in order to exchange information about network connectivity and media capabilities, and establish a suitable connection for screen sharing. Essentially, it is a way for the WebRTC system to adapt to changes in network conditions or device capabilities and ensure that the communication remains optimal throughout the screen sharing session.