What are the differences in 'ROS Time', 'ROS Elapsed', 'Wall Time', and 'Wall Elapsed'?

What are the differences in ‘ROS Time’, ‘ROS Elapsed’, ‘Wall Time’, and ‘Wall Elapsed’?

Am I right?
Wall Time is the system time. ROS Time can be system time; however, it can also be time from the /clock topic.


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