system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 Why can't I use one credit card to pay off another?

If the balance was kept low and paid off every month, couldn't the money keep rebounding between the two?
gpt
You can.  Credit card companies assess a fee for paying off other credit cards.  If the fee is less than your total savings from going from a higher-interest card to a lower-interest card, it might make sense to do this.

You cannot use one credit card to make the payment on another credit card, though.  That's called "robbing Peter to pay Paul."  Eventually, you'll hit your limits on both cards, and you'll be insolvent.

Edit: had to change a "to" to a "from"