HiFiBerry Power Supply

Hi guys,
i m Antonio and i am a new user. I just have a question (maybe stupid question), but i need to understand one thing.
Raspberry Pi power supply is 5V while HifiBerrt AMP2 need 12-18V..right?
I want understand one thing,considering i m new in electonic's world. I readed that i can t use a power supply up or down 5v if the device need 5v. So, how is possible that raspberry works with a 12v power supply? Surelly something give to raspberry only the 5v requested, but what?The Meanwell supplier or the connection with GPIO?!

Sorry for this question, but i will sleep more easy tonight if somebody will give me the light :P

Anyway, tnx for the answers

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