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Firstly, A Warm Welcome to the forum!
It's a question which has been asked here many times and the most likely answer is that:
- You have a 2.0T FSI engined car. (you don't say, and as much info as possible helps us to help you)
- It's normal on that engine. Try lifting the bonnet and standing by the engine bay - You'll hear it more strongly and it's part of the mechanicals (I forget which but someone else will doubtless post the answer).