Swiss German, also known as Schwyzerdütsch or Schweizerdeutsch, is a group of Alemannic dialects spoken in Switzerland. It is not a single standardised language but rather a collection of regional varieties that differ across cantons and even between communities. Swiss German is the most widely spoken language in Switzerland, with the majority of the population using it in their daily lives.

Unlike Standard German, which is the official written language in Switzerland, Swiss German is primarily a spoken language. It exhibits significant phonological, lexical, and grammatical variations across different regions. The dialects can be so distinct that speakers from one canton may find it challenging to understand those from another.

Swiss German is used in various domains of life, including informal conversations, family settings, and local media. While it does not have a standardised written form, speakers may use Standard German in written communication. The relationship between Swiss German and Standard German is similar to that between spoken and written English.

Efforts to standardise or create a unified written form for Swiss German have faced challenges due to the diverse nature of the dialects. Despite these variations, Swiss German remains a vital part of Swiss identity, culture, and daily communication. It reflects the linguistic diversity and regionalism present in Switzerland.