This report provides an overview of the Cassis de Dijon and Keck cases, which are pivotal in European Union Law concerning the free movement of goods. The Cassis de Dijon case established the principle of mutual recognition, allowing goods lawfully produced and marketed in one member state to be sold in another, even if they do not meet the importing state's standards. This case is significant as it restricts the use of national measures that impede trade. The report then examines the Keck case, which introduced the concept of 'selling arrangements' and clarified that certain national measures, which apply to all traders and affect the marketing of products, do not constitute measures having an equivalent effect to quantitative restrictions under Article 34 of the Treaty on the Functioning of the European Union (TFEU). The analysis includes the application of these legal principles, their impact on EU trade, and their role in shaping the internal market. The report also mentions the role of the Court of Justice of the European Union (CJEU) in shaping these laws.