This document discusses the use of corpus linguistics in lexicography. It defines lexicography as compiling, writing, or editing dictionaries. Practical lexicography focuses on writing dictionaries, while theoretical lexicography analyzes vocabulary and word meanings. Corpora used include written texts from various sources and transcribed spoken language. Corpora help inform new words, words that are no longer used, and differentiate formal and informal language. They also serve as a record of how language changes over time.