German is spoken in Germany, Switzerland and Austria. However, there are drastic differences within the countries because they speak different dialects. The Swiss insist on calling their ‘Schweizerdeutsch’ a language for itself. Individual words also differ between the German language and the Swiss ‘Schweizerdeutsch’. Some examples can be found below.
Based upon the first example, one can see the strong influence of the French language, one of the neighbours of Switzerland. ‘Velo’ is a French word.
The Austrian German experienced a strong influence from Bavaria, a part of southern Germany, hence numerous Bavarian expressions are popular in Austria.
For many Germans the regional differences and dialects are unusual and a strong dialect is difficult to understand. Hence calling the dialects an individual language is justified in some sense.