In the last thirty years, the world's economies have changed signifi cantly. New technology developments have enabled the transi� on from the industrial economy to the network economy. The network economy is based on informa� on technology, connec� vity and human knowledge. Its development has caused changes in the way of life, consumer behaviour on the markets and companies' business models, especially the process of goods and services crea� on and distribu� on. Electronic commerce and services have become one of the fastest developing fi elds of the economy. As a result, the role of government has diminished while the role of markets has increased economic transac� ons between countries and their ci� zens have substan� ally risen, and fi nancial transac-� ons have grown remarkably. This changing landscape has been characterised by globaliza� on and fi nancialisa� on. The increasing role of fi nancial mo� ves, fi nancial markets, and fi nancial ins� tu� ons have infl uenced domes� c and interna� onal transac� ons. A new category of fi nance called e-fi nance has been created and implemented. Despite the advantages of electronic fi nance networks, concurrently there are some disadvantages of their diff usion. The purpose of the paper is to present both aspects of fi nancialisa� on and its infl uence on the fi nancial and banking system. This purpose determines the structure of the paper. As fi nancialisa� on is a rela� vely new term the fi rst sec� on of the paper focuses on defi ning its phenomenon. This part presents diff erent authors' perspec� ves and defi ni� ons. Next, the infl uence of fi nancialisa� on on the Polish fi nancial system's quan� ta� ve and qualita� ve structure is discussed. The last sec� on focuses on the current role and func� ons of banks in the fi nance system network structure as a result of a rapidly changing technological environment.