Reinsurance is a type of cooperation between insurance companies. It is a practice whereby insurers transfer portions of their risk portfolios – and their premiums - to other parties, so that they can cover major projects by collateral that would not be possible based only on their own capital portfolio. In this case, the implementation and secure financing of the projects would be jeopardised. Several extremely costly projects may take place on the international level, the implementation of which may largely depend on the cooperation of export credit insurance companies, either in the form of reinsurance, or co-insurance. Cooperation may be required, for example in the case of major infrastructure projects, road, rail and power plant constructions or in the case of financing and insuring the building of expensive vehicles, ships or airplanes that require considerable resources from different countries and the combination of numerous internationally fragmented work stages in order to be able to succeed with the project.