Terms such as “Ontology” and “Semantic Web” are still a new territory for many. However, in today's information society, which is characterized by digitalization and automation, these terms are gaining more and more importance. We would like to show you why ontologies are becoming increasingly significant as the next logical step after the introduction of efficient terminology management and the establishment of a consistent terminology collection. But what are ontologies? What do they look like and how can they be represented? And what is their purpose - especially regarding their use in the Semantic Web?