Say you want to ask your friend if they want to eat, you could say
You want to eat?
Or,
Do you want to eat?
The first sentence, in speaking, sounds like a declarative sentence, but it has an interrogative meaning. I believe a similar phenomena happens in Arabic. Does this also hold in German?
As in, would
Du willst essen?
be same as,
Willst du essen?
Thanks.