This Practice Note provides an overview of Regulation (EU) 2016/399, the Schengen Borders Code, with a look at the requirements for entry into the Schengen territory by all persons and the provisions ensuring free movement without passport checks for all citizens across the internal Schengen territory. This Practice Note also examines the key derogation allowing Schengen Member States to maintain or re-introduce border checks at the internal borders within the Schengen territory.