Switching Power Adapter

OP #6511447
Hey, can someone explain to me how a SWITCHING POWER ADAPTER
works? At least that's what it says on my cell phone power adapter....
So it should actually be the same as a switch mode power
supply, right? But on the adapter it says OUTPUT: 5V 2A OR 9V 2A
OR 10V 4A
How does that work exactly?

Thanks!
Kind regards,

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