Another 'What's the diff Q" (LDo will like this)

(bash)  What is the difference between << and <<<, from a functionality
POV?  I.e., is there anything you can do with one but not the other?

I'm talking about this:

$ cmd << 'EOF'
...
...
EOF
$

vs.

$ cmd <<< '
...
...
'
$

Of course I know, as does everybody, that << is legacy and <<< is new, but
it begs the question: Why was <<< added to the language?

Note that I use both constructs, as the mood suits me, but I just got to
thinking that maybe <<< doesn't actually add any new functionality.

--
Adderall, pseudoephed, teleprompter