Are quotes a type of string delimiter? Or does 'delimiter' mean other types of characters not including quotes?

It means any character used to define the beginning and end of a string (e.g. Quotes but, in other contexts, other characters).

There's a subtle difference, if you're talking about string delimiters that nearly always means quotes, either " or '. If you're talking about a delimited string, then you're normal talking about a string of tokens, with delimiters between them ie "this,is,a,delimited,string" - It's very common to use a comma, as the delimiter, but that leads to issues when the token already contains a comma - for instance "one,million,dollars,$1,000,000" In this instance it's common to further delimit the token so we get "one,million,dollars,"$1,000,000"" another common alternative is to use an unusual character as the delimiter, and there's a minor convention to use the pipe symbol | "one|million|dollars|$1,000,000.

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