This article provides an overview of the four types of Japanese: Standard Japanese (Hyōjungo), Regional Dialects (Hōgen), Honorific Language (Keigo), and Slang (Giongo/Gitaigo). It explains some basic concepts about the language, such as its agglutinative structure and two writing systems. It then goes into detail about each type, describing their characteristics and how they are used in different contexts. Finally, it offers resources for further study.