A blook (a portmanteau of blog and book) is a printed book that contains content first published on a blog, web fiction platform, or social media service. While the term originated in the early 2000s to describe the "blog-to-book" phenomenon, it has expanded to encompass the broader industry trend of "digital-to-print" transition, where traditional publishers acquire webnovels, webcomics, and serial fiction that have demonstrated market viability through online metrics.