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.

https://design.ros2.org/articles/clock_and_time.html
https://wiki.ros.org/Clock

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