DMA – Digital Markets Act – is a European Union regulation that is part of a regulatory package designed to ensure that digital markets in which gatekeeper operate and remain contestable, i.e., that other market participants can exert competitive pressure on these gatekeepers and that fairness and a level playing field are ensured for players in digital markets in the EU. The regulation is designed to ensure that digital markets in which gatekeepers operate (i.e., companies that control market access for others due to their market power and network effects) are and remain contestable.