What is Portable power bank?

I'm on electronic products is not very understanding, so I would like to ask what is Portable power bank? Portable power bank is the power supply? But how can take the power go? Portable power bank is now before the emergence of the property? Or has been listed for a long time? How much is the price of Portable power bank? Because I would like to know more about the Portable power bank, but the power can follow the people moving, people will not be Portable power bank power? But, is why invent Portable power bank this product? If the Portable power bank can be used totake away, the other energy could also take away?

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