How does usb port charging work?

I'm a moment ago curious, I don't need a heavily industrial explanation.
I know that you can charge a number of things from the usb port of a computer.

Answer:
Same route plugging it in the wall works? Theres power surrounded by that there column. Stick your tongue on it :)
the usb cord adapters feed bad the electricity used to power your pc. its approaching a plug in cord for your computer...
>In your usb port when you plug things contained by a 12v current is passed through it. I think its 12 or it might be 5
USB be designed to send power and background through it. It sends a tiny percentage of the electricity in your computer through it, so you can usually charge tiny items.
In the mix of wiring surrounded by a USB port, there is a (power) flex in the USB port specifically linked to the power supply on your computer hence allowing the charging of your devices.

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