Remarketing campaigns are of great importance in digital advertising. The main goal of a remarketing campaign is to return visitors to websites or applications of advertisers they have already visited and encourage them to take desired actions. The purpose and goal of this paper are to explain more closely the concept of remarketing campaigns and their impact on purchase decisions. The above was achieved by defining the terms remarketing and retargeting, the technique of remarketing advertising, and the advantages and disadvantages of such advertising. Secondary data was used to write the theoretical part of the paper, most often from Internet sources, considering that it is a new topic that has yet to be sufficiently covered in books. Also, for the purpose of conducting primary research, a questionnaire was created using the Google Forms application. The questionnaire consisted of 12 questions that examined the demographic characteristics of the respondents, and the question is closely related to the topic of remarketing campaigns and their impact on the respondents. One of the key advantages of digital marketing is target group segmentation. Today's digital channels enable the collection and analyzing personal data about consumers. Based on them, the market is segmented, and marketing activities are personalized. Remarketing or repeated marketing is when an advertiser shows ads to users who have visited its website or application but have not performed the desired action (purchase, inquiry, registration). There are several types of remarketing and advertisers choose the one that best suits their business and target group. It is evident from the conducted research that remarketing campaigns have a tremendous impact on purchase decisions. Given that they are highly personalized, i.e., users see only ads relevant to them. Remarketing campaigns are shown to be very successful and can improve more in the future.