This study provides a systematic overview of articles and article systems in the world's languages using a sample of 104 languages. Articles can be classified into 10 types according to their referential functions: definite, anaphoric, weak definite, recognitional, indefinite, presentational, exclusive-specific, nonspecific, inclusive-specific, and referential articles. All 10 types are described in detail with examples from various languages of the world. The book also addresses crosslinguistic trends concerning the distribution and the development of different article types, and it proposes a typology of article systems. The aim of this study is to provide a general crosslinguistic overview concerning the attested properties and distributions of articles. It is geared towards readers with interests in language typology and the nominal domain, and it can serve as a point of reference for language-specific studies of articles or determiners.