There are two main types of questions in German:
• yes/no-questions which start with a verb and can be answered either in the affirmative or in the negative:
Sprechen Sie Deutsch?
Do you speak German?
Ist das Ihre Tasche?
Is that your bag?
• w-questions which start with a question word such as wer ‘who’, wo ‘where’, warum ‘why’ and tend to be more ‘open’:
Wo wohnst du?
Where do you live?
Warum hast du schlechte Laune?
Why are you in a bad mood?
Here are the two types in more detail.