English literature is generally used to refer not only to the literature of England but to all literary production of Great Britain (historically including Ireland) in the English language; the term “British literature” is quite uncommon.
There are many overlaps with the English-language literatures of other countries, such as former British colonies such as Australia or Canada, but since the 19th century American literature in particular has been understood as a national literature that is different from English. English literature is the subject of research in English Studies.