Croatia is a tourist country that has a great potential and space for progress. The digital era has changed the way in which tourist facilities fill their accommodation capacities, the sale is carried out online. It opened the door with new marketing tools. New, modern guests are the product of digital revolutions and their experience and knowledge are achieved through the internet. Internet enabled people to extract true, relevant and timely information with just one click. The task of internet marketing is to recognize and fulfill the wishes and needs of a contemporary guest. The offer of accommodation in tourism has never been more varied, which on the one hand is an advantage, and on the other hand a problem. Every detail can be of extraordinary importance to the guest, and therefore be crucial in selling. Therefore, the importance of internet marketing has never been greater. The main goal of this Final paper is to analyze the importance of internet marketing in tourism, and advertising and sales. Likewise, the main goal is to analyze the new marketing tools that the digital age has produced. The work consists of 12 chapters. The introductory chapter will define the subject and purpose of the work, sources and methods of data collection, and the content and structure of the work. The second chapter will generally talk about marketing in tourism and its importance for Croatia. The third chapter will make an introduction to internet marketing. The fourth chapter will explain which are the basic communication tools in internet marketing in tourism. The fifth chapter refers to the importance and ways of using social networks in tourism. The sixth chapter refers to online search engines and search engines as an important source of information for a contemporary guest. The seventh chapter analyzes what online retailers are doing through the sale of accommodation capacities. Eighth chapter talks about advertising through leading tourist agencies. Chapter 9 analyzes the use of mobile applications in tourist internet marketing. The tenth chapter refers to advertising on domestic tourist portals. The eleventh chapter deals with modern ways of financing internet marketing. In the final chapter was presented the conclusion of this Final paper.