 Hi, this unit discusses the different approaches towards language, dialect and variety. It provides you with several criteria of language definition as well as with numerous problems that are involved. In the virtual session, with which we recommend to start, we will see that it is not easy to distinguish between language and dialect. If two people speak differently, we may assume that there are only two possibilities. If they understand each other, they must speak dialects of the same language. If not, they can be said to speak different languages. But it will be shown that it is not that simple. By the way, 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 you with some introductory questions about language in our dynamic multiple choice format. All questions are discussed in the virtual session. And finally, like all units, this one involves a practical sheet too, 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.