Tax havens are a certain haven for many international corporations and the world's wealthiest people due to the many tax benefits they offer. Depositing money in tax havens is a legal business as long as the depositor pays the taxes required by the domestic jurisdiction, without requiring companies to do business outside their country or individuals to reside in their country to receive tax breaks. By attracting foreign individuals or businesses, even if they are charged only a nominal tax rate, a country that represents an offshore market can earn significantly more in tax revenue than it would otherwise. On the other hand, for many countries, tax havens represent losses in the form of dizzyingly high amounts of income tax. Awareness of the reality of how exotic foreign economies, such as the Caribbean and the Alps, hide much more than is known is growing stronger year by year. But even though this is increasingly being talked about and known in public, the popularity of the offshore market is not waning it is even stronger than ever before. Owning an offshore company is not illegal, but the latest research shows that concealing the identity of the real owners of the company is the primary goal of most businesses. Accordingly, in this thesis, the functioning of the offshore market is presented in more detail and an overview of the most important research on business and participants in tax havens is given.