In 2019, the EU legislature adopted Directive 2019/790 on copyright in the Digital Single Market. The Directive is supported by a multi-faceted rationale and represents one of the most significant and ambitious EU harmonization efforts in the copyright field so far. This book provides an article-by-article commentary to all the provisions of the Directive. It is the first complete commentary to Directive 2019/790. By analyzing the history, objectives, and content of each and every provision, as well as the relationship between some of those provisions and between the Directive and the pre-existing acquis, this book provides a rational, consistent and detailed explanation of the Directive as a whole and of its individual contents. This Commentary will be a travel companion to all those who wish or need to navigate the legislative provisions that were adopted in 2019 to make EU copyright fit for the "digital single market".