This bachelor thesis is focused on familiarizing the reader with the phenomenon of the YouTube social network and its possibilities for business support. The first chapter of the theoretical part introduces the reader to the basic characteristics of online marketing and its tools. The second chapter is dedicated to the YouTube social network, where the reader first learns about the key moments in YouTube history and current statistical facts. Furthermore the bachelor thesis describes the YouTube community, the use of YouTube in business and the use of YouTube as a source of incomes. The practical part deals with the analysis of selected YouTube channels divided into categories according to their content. The aim of this thesis is to analyse...