The aim of the paper is to show how digital transformation affects the consumer and sales in general, focusing on the example of mediation in real estate transactions. The paper describes the history of digital transformation, as well as the advantages and disadvantages that digital transformation brings. A theoretical framework was set up, which was accompanied by the example of an agency dealing with real estate brokerage. Various scientific articles that previously dealt with this issue were used, as well as a number of different books related to this area. In addition, the paper focused on the advantages and disadvantages of online shopping. The paper covered the risks that consumers are exposed to when shopping online and the protective measures that can be taken by both companies and consumers to make online shopping as safe as possible. Several large companies with excellent sales systems and a high level of protection when paying online are listed as business examples. Assortment management is a topic that builds on online shopping and digital transformation. The paper covered the basic definitions of assortment management, as well as certain processes that are key to quality assortment management. In addition to basic definitions, the work covered the way in which assortment management is developed and how it is applied in the real world. At the end, the work included a complete example of digital transformation in the case of mediation in real estate transactions. The focus is on the sale of real estate in Croatia. It was explained how digital tools have helped in the process of buying and selling real estate, focusing on the paperwork required for the purchase and sale, but also on the marketing strategies used to sell the property better and faster.