Portrait of a Warrior Asmat tribe in traditional headdress.
By definition, endangered languages are those that are facing extinction in the future. Several languages are not being used and are replaced by languages that are widely spoken in various countries and regions. If the trends are not reversed, the next century will see a few more of them becoming extinct.
Many older languages only have very few speakers since they are no longer taught or learned by younger people. When the last speakers of endangered languages die, the languages die with them, unless there are efforts to revive the language.