Today, technological developments have brought important innovations in financial markets as well as in many areas. The proliferation of devices such as smartphones, tablets and computers, the ease of access to the internet, and the continuation of breakthroughs in technology without slowing down have brought along a rapid digitalization in all transactions in financial markets. Especially the developments in the software world and the release of powerful processors have allowed the spread of cryptocurrencies and the development of blockchain technology. All these developments have led to a rapid increase in the number of Financial Technologies (FinTech). The first FinTech period lasted about 100 years and important developments were experienced in that period. The second FinTech period lasted about 40 years and compared to the first period, revolutionary financial technologies were offered to companies and users. The third FinTech period is a process that includes the process we are still in and has been going on for about 15 years. Compared to the first two periods, more innovative products and services were offered to users in the third period. Recently, virtual assets have started to replace physical assets, and virtual branches have begun to replace physical branches. The most popular of these is the replacement of country currencies by cryptocurrencies. In this study, technological developments affecting financial markets are explained and the effects of these developments on financial markets and their efficiency of use are evaluated.