German is the most spoken (and official) language in Germany, Austria, Switzerland, the Italian province of South Tyrol (Alto Adige) and Liechtenstein; it is also an official (but not majority) language of Belgium and Luxembourg. With slightly different standardized variants (German, Austrian, and Swiss Standard German), German is a pluricentric language. German is also notable for its broad spectrum of dialects, with many unique varieties existing in Europe and also other parts of the world. Due to the limited intelligibility between certain varieties and Standard German, as well as the lack of an undisputed, scientific difference between a “dialect” and a “language”, some German varieties or dialect groups (e.g. Low German/Plautdietsch) are alternatively referred to as “languages” and “dialects”.