The diploma thesis deals with the online marketing strategy and online activities of the company AQT.sk. The aim of the thesis is to analyze this strategy, individual tools and activities that the company uses and to propose further steps to improve the performance and efficiency of online marketing as a component of the communication mix. Theoretical part briefly describes the development of online marketing and at the same time presents in detail individual online marketing tools and their possibilities. In the practical part of the thesis is processed situation analysis, which is focused on the market, competition and customers of AQT.sk. The main part of the thesis is the analysis and evaluation of its current online marketing activitie...