Regarding ROS(Meta operating system for robots) software

I am working on the simulation of care-o-bot technologies (beginner to ROS). I read the ROS开发者_如何学Go documentation and found some two similar things i.e. RVIZ and GAZEBO. Would you please tell me the difference between them...

RViz is a visualization tool for data coming from the Navigation Stack.

Gazebo is a 3D Robot simulator

Gaebo is a robot simulator. Rviz on the other hand is a limited - though very useful- visualization tool. When I say limited I mean that it is usually one-way. The ROS application publish messages and these are visualized in Rviz

There can be some kind of interactivity in Rviz (I have implemented menus in them for example) but it is not fully interactive