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Here you go:

It's basically using your wallet (and PC) to perform transaction confirmations on the network, sort of like the function of mining, except there is incentive to hold coins (which helps stabilize the price, because there are that many fewer coins being traded ((which in turn means less opportunities on exchanges for prices to go up and down.)))

@ricecakeonfire, Thanks for this, POS is a lot clearer to me now!