 Hi, this introductory unit, probably your first contact with linguistics, introduces the central aspects of language and communication and explains why linguistics is such an important subject to study. In the virtual session with which we recommend to start, we will discuss the differences between language and communication. We will look at human and animal communication systems. We will define the branches of linguistics and we will put forward several arguments in favor of studying linguistics. If you are not sure where to start in the virtual session, you can use the optional question sheet with its hyperlinks as default guidance. The mastery worksheet presents some introductory questions about language, communication and linguistics that are all discussed in the virtual session. Finally, like all units, this one involves a practical sheet where you find numerous interesting linguistic phenomena ready for analysis. Try on your own first. The model solutions will be given once the next unit comes into focus. Surely, a lot of material, but we are sure, at the same time, enjoyable and profitable. So, good luck.