In this final work it is defined what e-commerce is, and its development from the very beginnings to the present day has been presented. This article describes history, the state of e-commerce today and the trends that are expected in the future. In addition, the advantages and disadvantages, security and payment methods in e-commerce are explained. It is described how e-commerce has developed in the Republic of Croatia and why we are late for developed countries and what is the state today. As part of this work, research has been carried out to determine how satisfied users are with e-commerce in the Republic of Croatia. The research was conducted in the period of 11.07.2018. until 30.07.2018. on a sample of 125 respondents. Using the KwikSurveys application, a poll is created, for which the link is shared over the social network Facebook and via e-mail. The questionnaire consists of 27 questions, 3 questions pertaining to demography and 24 questions related to research. Research results show that users are generally satisfied with e-commerce in the Republic of Croatia. Partial satisfaction has been shown by users to the level of security in e-commerce payments and the ability to reclaim and reclaim products in e-commerce.