What characterizes a book?

A book is fundamentally defined as a written or printed work consisting of pages that are bound together. This definition encompasses a variety of formats, including novels, textbooks, and anthologies, all of which have pages that convey written content, whether in print or digital formats. The binding of pages distinguishes books from other formats, such as magazines or pamphlets, which may not have the same structure or durability.

The other options describe different forms of content or mediums. For instance, a vehicle for delivering news and events refers more to newspapers or news articles, while a collection of musical notes pertains to sheet music, and an online article relates to digital journalism or blogging. These definitions highlight the unique characteristics of these formats, which do not align with the fundamental structure and purpose of what constitutes a book.