Mirror Networking Multiplayer

Mirror is an open-source networking library for multiplayer games in Unity. You define network objects (players, NPCs, items), mark them for synchronization, and Mirror handles distributing state changes across players. Example: when player A moves right, Mirror detects the change, sends to server, server broadcasts to all other players. Architecture options: client-server (single source of truth = server) or peer-to-peer (distributed). Client-server is more secure (server validates all actions), peer-to-peer is lower latency (direct player connection).