Understanding APR Question

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Hello BP Family. I just have a quick question about understanding "APR." I think I am over thinking this, but I just wanted to make sure I fully understand it.

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Here's my example:

Bank A Has...

30-year fix loan at 4%

Points = 2.15

APR = 4.179%

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How does the APR tie into the 4% (from interest of the 30-year loan)? Or is the APR the percentage of the loan with all the added fees?

Thanks!