1. **Genetic Classification**: - **Key Criteria**: Genetic classification categorizes languages based on their historical and genetic relationships. Linguists group languages into language families, which are languages that share a common ancestor. Languages within the same family are believed to have evolved from a common source and share many linguistic features. - **Problems**: - Language relationships can be complex and challenging to trace, especially for languages with limited historical records. - Some languages may have borrowed extensively from other unrelated languages, making their classification more challenging. - Genetic classification is based on historical evidence, which may not always be available or accurate.