Navajo is part of the Athabaskan language family. A language family is a group of languages that are related to each other and come from a common ancestor language. For example, English is part of the Indo-European language family because it has a lot of similarities with languages spoken in Europe, the Middle East, and the Indian subcontinent. Navajo is one of the most southernmost Athabaskan languages. Other Athabaskan languages are spoken in Alaska and on the Pacific coast.