The aim of this bachelor's thesis is to find interesting relationships in a set of real data by using techniques of data mining. This is achieved by searching for answers to given analytical questions. The analysis was based on a dataset describing the housing market in Russia. The data were obtained from Kaggle.com, which is a platform focused on data processing. The whole work is divided into theoretical and practical part.The theoretical part summarizes available basic information about data mining and process of knowledge discovery in databases (KDD), which data mining is a part of. The definitions, history of this discipline and the most used methodologies, especially the CRISP-DM methodology, which determines the steps according to wh...