BookTube is a subcommunity on YouTube that focuses on books and literature. The BookTube community has, to date, reached hundreds of thousands of viewers worldwide. While the majority of BookTubers focus on Young Adult literature, many address other genres. BookTube videos also generally follow a set of formats, often drawing upon the wider "bookish" culture and lexicon. There is a distinct set of recognizable faces within BookTube as well as some content created by the publishing community. BookTube is often used to advertise new publications and is cited as a source of growth for the publishing industry.