The term “financial system” is understood by many as referring to large companies and international organisations; they do not believe that ordinary citizens are part of this system. However, this understanding is completely inaccurate: everyone is involved in the financial system, regardless of lifestyle, employment status, their field or the size of their business. This article presents significant information about the financial system and essential banking activities in Greece, which are important factors for the overall functioning of the economy. Furthermore, we are going to learn about various forms of lending and the advantages and disadvantages of bank lending. It also explains the use of POS systems which facilitate financial transactions. The financial system is intended to provide a safe environment for all transactors and ensure trust between financial units. In addition, it provides funding to those who do not have the necessary financial resources to cope with an investment. Evidently, banks in Greece have evolved significantly and offer contemporary products, such as insurances, portfolio investments, factoring and leasing. Consequently, electronic transactions in Greece have increased and evolved in recent years, due to e-banking, POS systems and electronic bank transfers.