to add to what Ann said ( or explain further); "smart" quotes are
curly ones; (stop reading here if this is all you want to know,
smile)
I've pasted directly below a definition and example from Wikipedia,
but I also, not being able to resist because I found it interesting,
and have never known when to stop explanations, (drove my daughter
crazy but her friends appreciated it, as one told me years later)
pasted a more detailed explanation of of quotation marks (I didn't
know the curly ones were called English curved quotes).
a definition and example form Wkipedia: ‘—’ : English curved quotes,
also called “book quotes” or “curly quotes”, resemble small figures
six and nine raised above the baseline (like 6...9 and 66...99), . In
many typefaces, the shapes are the same as those of an inverted
(upside down) and normal comma.
Typewriter quotation marks
"Ambidextrous" quotation marks were introduced on typewriters to
reduce the number of keys on the keyboard, and were inherited by
computer keyboards and character sets. Some computer systems designed
in the past had character sets with proper opening and closing quotes.
However, the ASCII character set, which has been used on a wide
variety of computers since the 1960s, only contained straight single
quote (U+0027 ' apostrophe) and double quote (U+0022 " quotation
mark).
