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rosbridge is simply a protocol specification for external clients to communicate with ROS (https://github.com/RobotWebTools/rosbridge_suite/blob/develop/ROSBRIDGE_PROTOCOL.md). By running rosbridge server, you are allowing any external client to connect to a ROS system via either a WebSocket or TCP connection (depending on which server you start). roslibjs is a JavaScript client library; however it is not the only option. A Java implementation also exists (https://github.com/WPI-RAIL/jrosbridge/) any other languages can also implement the protocol and become a client as well.