What is the difference between kill-ring-save and copy-region-as-kill?

Question

These two commands seem identical to me. What am I missing?

Answer 1

Documentation for kill-ring-save:

[...] This command is similar to ‘copy-region-as-kill’, except that it gives visual feedback indicating the extent of the region being copied.

Documentation for copy-region-as-kill:

[...] This command’s old key binding has been given to ‘kill-ring-save’.

You can use C-h f <function-name> to show the help of the function.