General Usage Rules In America, Canada, Australia and New Zealand, the general rule is that double quotes are used to denote direct speech. Single quotes are used to enclose a quote within a quote , a quote within a headline, or a title within a quote .
Single quotation marks are used to indicate quotations inside of other quotations . “Jessie said, ‘Goodbye,’” Ben said. This is Ben talking, so his words go in quotation marks . But because we’re quoting Ben quoting someone else, Jessie, we use single quotation marks to indicate the quote within the quote .
American English traditionally uses double quotation marks for dialogue, quoted words and phrases, and scare quotes (except in some technical areas) and single quotation marks for quotes within a quote, whereas British English does the reverse and uses mainly single quotation marks with doubles for quotes within a
‘ Single quotes “ escape ” single quotes ‘ When using single quotes ( ” ) to create a string literal, the single quote character needs to be escaped using a backslash ( ‘ ).
Quotation marks are also called inverted commas, speech marks, or quotes . Quotation marks can be used in two styles; single (‘ ‘ or ‘) or double (“ ” or “), and can also appear in two different typefaces; either as so called dumb or straight quotes (‘ or “) or as smart quotes (‘ ‘ or “ ”).
If you are an American, using quotation marks could hardly be simpler: Use double quotation marks at all times unless quoting something within a quotation, when you use single. It’s different in the greater Anglosphere, where they generally use singles in books and doubles in newspapers.
The basic difference being the precision between the two types. Now contary to the name, its not the precision that doubles. Its the number of Bits used in your computer memory for storing the data that doubles. Single datatype uses 32 bits of memory whereas Double uses 64 bits of memory.
Quotation marks around single words can occasionally be used for emphasis , but only when quoting a word or term someone else used . If a word needs to be emphasized but is not being quoted, you should avoid putting the word in quotes and use italics instead.
HTML Entities for Quotation Marks, Code Table
|«||«||Left-Pointing Double Angle Quotation Mark|
|»||»||Right-Pointing Double Angle Quotation Mark|
Scare quotes (also called shudder quotes , sneer quotes , and quibble marks) are quotation marks that writers place around a word or phrase to signal that they are using it in an ironic, referential, or otherwise non-standard sense.
If you use single quotation marks, then you should use double quotation marks for a quote within a quote. If you use double quotation marks, then you should use single quotation marks for a quote within a quote.
Punctuation inside speech marks Each section of direct speech should end with a punctuation mark . If there is no reporting clause then this is likely to be a full stop , question mark or exclamation mark : Notice that these punctuation marks are included inside the speech marks .
 In common usage, there may be a distinction between the single and double quotation marks in this context; often, single quotation marks are used to embrace single characters, while double quotation marks enclose whole words or phrases[.]