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British English tends to reverse the usage—single quotation marks ( In American English, double quotes are used normally (the "primary" style).
If quote marks are used inside another pair of quote marks, then single quotes are used as the "secondary" style.
In Britain those marks were elevated to the same height of the top of capital letters ( claim that the reason for this was a practical one, in order to get a character that was clearly distinguishable from the apostrophes, the commas and the parenthesis (also, in other scripts, the angular quotation marks are distinguishable from other punctuation characters—the Greek breathing marks, the Armenian emphasis and apostrophe, the Arabic comma, decimal separator, thousands separator, etc.).
claim that the reason for this was an aesthetic one.
Because most of the computer keyboards lack keys to directly enter typographic quotation marks, much typed writing has vertical quotation marks.
British English tends to have the opposite convention – single quotes are primary, and double quotes are secondary; however, this distinction dates back only to around the 1960s.with the 'English-style' quotation marks being preferred.However, it still can be found on older shop signs and in most large newspapers.In most other languages, including English, the marginal marks dropped out of use in the last years of the eighteenth century.The usage of a pair of marks, closing and opening, at the level of lower case letters was generalized.
The double quotation mark is older than the single.