This document discusses endangered languages. It defines an endangered language as one at risk of no longer being spoken as its speakers die out or shift to other languages. Languages become endangered for various reasons, such as a lack of transmission between generations, small speaker populations, war, negative attitudes, and pressure to adopt dominant languages. The document classifies languages based on their degree of endangerment from vulnerable to extinct. Losing a language can negatively impact communities by weakening cultural traditions and identity. UNESCO works to safeguard endangered languages through supporting education in local languages, collecting language data, and promoting multilingualism.