I looked everywhere but i couldn"t find an any information about this.
In one course i saw a word “der Stau” and it’s meaning is "the Jam"
I asked this word to my teacher and he said this word can’t be use like this.
Google translate says: Stau is also mean the jam.
Duden says: it is not.
i googled this word
die Erdbeere Stau : Strawberry jam
I’m so confused now.
Hallo Schachtrufer,
der Stau means often der Verkehrsstau. Verkehrsstau is traffic jam.
Strawberry jam is Erdbeermarmelade. 
“der Stau” would be better translated as “traffic jam”, not just as “jam”. At least in British English we usually say things like “I got stuck in a traffic jam”.
“Jam” used by itself would make you definitely think of “Marmelade” 
Can you say which course this problem appeared in and add a link, please?