What is the rarest language?

The rarest language in the world is considered to be Taa, also known as !Xóõ. It is spoken by only about 5,000 people, mainly in Botswana and Namibia. Taa is a language with click sounds, which makes it unique and difficult to learn for speakers of other languages. It has a complex sound system with 164 phonemes, including 48 click sounds. Taa is an endangered language as it is not being passed on to younger generations due to the influence of other languages and cultures. Efforts are being made by linguists and language preservation organizations to document and preserve this rare language.