E-commerce has become an unavoidable factor in the sale and purchase of all goods and services. With the help of e-commerce tools, it is possible to reach every consumer on the market, and the only condition for using e-commerce is to have a mobile device or a computer and a stable Internet connection with which data is transmitted. The market for used motor vehicles is different from the market for new motor vehicles because when selling and buying used motor vehicles, there are a number of questions and problems faced by buyers and sellers. It is precisely in the fact that the item of trade is used that a potential opportunity or problem lies. Due to the complexity of the used motor vehicle market, dealers, as well as buyers, are forced to use different e-commerce tools to achieve their goals. Platforms use tools and their search engines to connect potential buyers and sellers with the goal of concluding a deal for the purchase and sale of a used motor vehicle. Platforms for advertising and buying and selling used motor vehicles are the primary meeting point for supply and demand in the used motor vehicle market. Croatian platforms are at a satisfactory level, but they still cannot be adequately compared with foreign platforms that have much more detailed search engines and offer related services and a number of other various benefits. The Republic of Croatia generates high revenues thanks to the trade in used motor vehicles based on the Special tax on motor vehicles and the fee that importers pay to the Fund for Environmental Protection and Energy Efficiency. With the development of trade in used motor vehicles, many other related activities are also developing. For the purposes of writing the thesis, empirical research was conducted based on a survey. Thanks to the conducted research, concrete data was obtained on the basis of which the importance of electronic commerce in the sale of used motor vehicles can be recognized. Currently, the best combination of electronic and traditional trade in used motor vehicles is, but the future certainly brings new challenges for the participants of the used motor vehicle market.