This document discusses the field of lexicography, which involves both the theoretical and practical aspects of dictionary making. It defines lexicography and outlines its history, providing examples of early dictionaries. It also describes the types of lexicography as either practical (involving compilation and editing) or theoretical (analyzing semantic relations and developing dictionary structure theories). Finally, it discusses the various stages involved in practical lexicography, such as acquiring lexicon entries, structuring information, writing entries, and updating/archiving entries.