First draft
A text's first complete version, written to exist rather than to be good — the book's raw material.
The first draft is the first complete crossing of the text, start to finish. Its only mission is to exist: it turns an intention into workable material. Practitioners massively agree on one point — the first draft is allowed to be bad, and trying to make it good while writing it is the #1 cause of never-finished novels.
The two golden rules: move forward without rereading (revision is a different job that starts after "the end") and protect momentum (a hole or a failed scene gets a [FIX LATER] tag and you keep going). Hemingway, Terry Pratchett and many others repeated the same idea in different forms: the first draft is the author telling themselves the story.
Example
50,000 imperfect words beat three polished chapters of an abandoned novel.