Can someone explain this to me (credit vs. debit)?

Question by •Poppy•: Can someone explain this to me (credit vs. debit)?
When I turned 18, I got a debit card from my bank. This was the first real means of money that wasn't cash I had personally used - no checks, no credit cards, no debit cards previously. (I still don't use checks).

Anyhow, when I got the card the woman who was helping me made it very clear that it was more cost-effective for me to run my debit card as credit instead of running it as debit and putting in my PIN. It

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