The Digital Markets Act (DMA) regulates core digital platform services such as online search engines, web browsers, advertising services, social network services, and video-sharing platforms that meet the gatekeeper thresholds. The DMA aims to ensure and maintain contestability in core digital platforms and fairness in the interactions between digital platform providers, business users, and end-users. To achieve this, DMA includes interoperability, data handling, transparency, fairness and merger notification requirements. This thread outlines the DMA's requirements, its secondary legislation and the Member States' legislation on competent authorities that will coordinate with the European Commission in overseeing the implementation and enforcement of the rules.