The lexical approach focuses on teaching language as chunks or multi-word phrases rather than as individual words and grammar rules. It asserts that much of a language consists of prefabricated phrases and that students should learn these phrases as chunks. The key principles are that the lexicon, or vocabulary, makes up the main part of a language and that lexical chunks like phrases and collocations are important units for students to learn as they are used by native speakers. Advocates of this approach believe it helps increase students' fluency and acquisition of natural language patterns.