A book is more than a collection of pages, of course. A novel requires engaging characters and a page-turner plot. A nonfiction book needs to meet a demand.
A publishable book needs much more:
* Your book needs an audience: the way publishing works today, you must prove to a publisher that an audience exists for your book. So market research is vital, before you start writing.
* Your book needs an agent and publisher;
* While you write, and after your book is published, you'll need to promote your book: as the author, that's a most important task, and all publishers require their authors to take an active role in marketing.
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