String literals are specified by a sequence of characters between ' (single quote) characters.

To use quotation marks within a string literal, use the “ character.

Examples of string literals include:
'Welcome, visitors.'
'I said, "hello"'
'Numbers like 7 are legal in string literals'
Examples of invalid string literals include:
(missing closing ')
'I said, 'hello''
(wrong quotation character within the string)

(incorrect delimiters)