How do we group and categorize languages? What does it mean that two languages are related? What is a parent language? Which languages are more closely related and which are not? Some languages are genetically related, meaning they have a common origin, while others are typologically similar, in that they have similar structures. While English is well known, and Indo-European, the language family it is in is also well studied, it is just one of 7000 languages in the world. We will explore the world's languages, how they fit into their own families, discuss how relationships are determined, and what we can learn when talk about language families. This module can be taken by itself or as part of a larger Introductory Linguistics sequence of modules.