Language documentation is a subfield of linguistics that focuses on the systematic collection and recording of data related to endangered or lesser-known languages. This involves documenting various aspects of a language, such as its grammar, vocabulary, phonetics, and usage patterns. The goal of language documentation is to create a comprehensive record of a language before it becomes extinct, and to preserve linguistic diversity for future generations. Researchers in this field typically work closely with native speakers of the language to collect data and create linguistic resources that can be used for language revitalization, education, and research.