Advise on using card swiping machine

HI,
I Manage a store. We are making some changes in our business. We are going to start a website and upgrade e-payment services. I need to get a card swiping machine. I am searching for a quality service. I searched and found in the merchant services of Versapay that they are providing pin pads and POS terminals. Both looks same to me. What are the differences between them? Pls share.
And what are the security measures to take while using it if any?
Need advise.
Thank you.

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