What happens to Bitcoin wallet / Bitcoins if PC is stolen

[Bitcoin]

What happens to Bitcoin wallet / Bitcoins if PC is stolen

I am a beginner and just starting to explore the possibilities of Bitcoins. So I would be very grateful if somebody could help me with this question.
Is there a risk that my Bitcoins are lost if the PC with the bitcoins resp. with the Bitcoin wallet stored on it is stolen or has crashed? Thank you very much. 

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