Literature is not only always written, it is only written. Literature literally means "Things made of letters." the term comes from 14th century Latin (litterātūra), translated "writing formed with letters."
No, literature can also be spoken or transmitted orally through storytelling or poetry. While written literature is common, oral traditions have played a significant role in the preservation and transmission of literary works throughout history.
Literature can also be transferred by oral means of communicating
Clearly you have just proven that no, no it is not. Especially not anything you write. Ever.
I use the term "written literature" to distinguish it from oral traditions or other forms of storytelling. It refers to literature that is recorded and preserved in written form.
Kenneth Bell has written: 'Puritanism and liberty' 'The literature of the humanities' 'The literature of philosophy' 'The literature of literature'
gothic literature was written in 1760-1830
Hebrew literature is written using the Hebrew language. No other literature is written that way (or else it would become Hebrew literature).
John A. Kersey has written: 'Ethics of literature' -- subject(s): Literature 'Ethics of literature'
Friend of literature has written: 'Fatal effects of seduction'
Karl Keller has written: 'The example of Edward Taylor' -- subject(s): American Christian poetry, American Devotional literature, American Poets, Biography, History and criticism, Puritan movements in literature, Puritans in literature 'The only kangaroo among the beauty' -- subject(s): America, In literature, Knowledge, National characteristics, American, in literature
Kenneth O'Brien has written: 'The sociology of literature' -- subject(s): Literature and history, Literature and society
Alfred Howard has written: 'The beauties of literature' -- subject(s): Collections, English literature, Literature
Steve Brie has written: 'Literature and ethics' -- subject(s): Literature and morals, Ethics in literature
Sharae Deckard has written: 'Paradise discourse, imperialism, and globalization' -- subject(s): In literature, Literature and globalization, Colonies in literature, Paradise in literature, Imperialism in literature
Luke Gibbons has written: 'Gaelic Gothic' -- subject(s): Gothic revival (Literature), Colonies in literature, Literature and society, In literature, History, Race in literature