Language instruction is a field of research focused on the theory and practice of teaching languages to individuals of various proficiency levels. Researchers in this area explore methods for effectively teaching language skills, such as grammar, vocabulary, speaking, listening, reading, and writing. They may also investigate the role of culture in language learning, the use of technology in instruction, and the impact of different teaching approaches on student outcomes. Ultimately, the goal of language instruction research is to improve language teaching strategies and help learners develop proficiency in a new language.