The single market is one of the key elements of European integration. The single market of the European Union is a unique concept that has changed the way goods, services, capital and people move within the EU. The single market was established with the aim of creating a seamless and integrated economic area. The free flow of goods and services enables the flow between member countries, without tariffs and quotas. This stimulates trade, opens up new markets for businesses and increases choice and competition for consumers. The free flow of capital enables the flow of capital between member countries, which facilitates investments, financing companies and creating new jobs. The free movement of labor enables the flow of labor, which means that EU citizens can work and live in any EU country. This helps reduce unemployment, improves labor mobility and facilitates the attraction of highly skilled workers. The EU single market also includes efforts to harmonize regulations among member countries. This reduces administrative barriers and facilitates cross-border business. It also encourages competition as businesses need to be competitive in order to survive in the wider market. This leads to greater choice, lower prices and improved quality of products and services. The main goal of the work is to investigate the European Union and the policy of the single market. The purpose of the paper is to investigate the member countries and their contributions to the common market, as well as to explore potential plans for improving and strengthening the common market. Many scientific methods were used in the work, such as historical, statistical and similar, and the work was supported by professional literature from libraries and literature downloaded from the Internet.