The Japanese people (日本人 Nihonjin, Nipponjin?) are a nationality originating in the Japanese archipelago and are the predominant ethnic group of Japan. Ethnic Japanese make up 98.5% of the total population. Worldwide, approximately 130 million people are of Japanese descent; of these, approximately 127 million are residents of Japan. People of Japanese ancestry who live in other countries are referred to as nikkeijin (日系人?). The term ethnic Japanese may also be used in some contexts to refer to a locus of ethnic groups including the Yamato, Ainu and Ryukyuan people.
The Japanese language is a Japonic language that is sometimes treated as a language isolate; it is also related to the Ryukyuan languages, and both are suggested to be part of the proposed Altaic language family. The Japanese language has a tripartite writing system using Hiragana, Katakana, and Kanji. Domestic Japanese people use primarily Japanese for daily interaction. The adult literacy rate in Japan exceeds 99%