We've heard about animals or wildlife being endangered and becoming extinct, but what about a language?
Well that's exactly what's happening on the Isle of Man with their traditional language of Manx.
About 250 years ago everyone on the island spoke Manx.
But it was declared extinct by Unesco, the UN group in charge of heritage, four years ago because there aren't enough people who use and understand it.
Ore reports on the one and only school in the world trying to keep Manx alive by teaching it to kids.