Port systems represent an important and important role and function in traffic and business in today's world. This paper will present the operation of port systems and their importance and connectivity within the system, giving an overview of their importance today. Their distribution and distribution in the world will be presented, and a special consideration will be given to the new situation in which the whole world is located,COVID-19, and a special consideration will be given to the new situation in which the world is located by studying previous periods and current periods. Ports are the main drivers of trade and traffic within maritime transport, which have a significant and indispensable function in the context of trade and exchange of services in the world and as such will be given a special importance and a detailed overview of their work, work methods and interconnectedness which results in successful business today. It will look at global and world trade and a comparison of recent periods with the current situation has caused major changes in quality, quantity and speed of delivery. The importance of maritime traffic and its impact on the world will be emphasized, as well as examples of particular world and ports in the Republic of Croatia and a special overview of their work and expectations that bring about thefuture. It will present the essential and great importance of the port system as a whole as an extremely important and important factor in the advancement of the global world, trade and communication and development of countries and the world as a whole. Ports are tasked with strenuously improving their service, adapting to the market, always preparing for change and, as such, very important and will be given special attention to explain their importance and impact on the whole world.