Okay kiddo, have you ever heard people speak different languages or with different accents? Well, there is something called the Uerdingen line that helps us understand why people sound different from each other.
The Uerdingen line is a imaginary line that separates two different types of German language pronunciation. The people who speak with the different types are usually separated regionally in Germany.
The line starts in the town of Uerdingen, which is why it is called the Uerdingen line. It then goes through Germany, from west to east, and separates the northern and southern German dialects.
In the north, people usually pronounce words with a sharp "s" sound like in "sit" or "see." In the south, people pronounce those same words with a "sh" sound like in "shut" or "shoe." Also, in the south, people say the letter "r" differently, usually with a rolling sound, while in the north it may sound harder.
It's pretty interesting, huh? So next time you hear someone speaking German, try to listen and see if you can tell if they are from the north or the south of the Uerdingen line.