The tourism sector plays a crucial role in the economic growth of many countries. With the advent of new digital technologies, tourism is becoming a leading field for mobile applications, which today offer many functionalities to enhance the tourist's experience and satisfaction before, during, and after the visit. Despite the existence of these applications, all functionalities related to this sector remain scattered, and this dispersion of data can lead to a poor experience for all stakeholders. Therefore, it becomes necessary to consolidate all tourism knowledge into a model that provides precise, coherent, and comprehensive information on all aspects of this field. In this paper, we propose a domain model for tourism that meets the needs of all stakeholders and provides the most comprehensive description possible of the field. We also discuss the main applications of this model in the field of tourism and software engineering.