Make A Hard Drive Into An External Hard Drive?

I have a Dell Computer as well as a Dell Laptop. I also have two Hard drives that I took from a couple old computers before I discarded them. I am curious. Question 1: How would I go about making the old hard drives into external hard drives? Question 2: How do I bridge the external hard drives to the existing... show more I have a Dell Computer as well as a Dell Laptop. I also have two Hard drives that I took from a couple old computers before I discarded them.
I am curious. Question 1: How would I go about making the old hard drives into external hard drives? Question 2: How do I bridge the external hard drives to the existing computers I now have? I hope these questions give enough details to help me.
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