ELI5 the difference between a bitcoin address that starts by 1 and 3

I've been searching on Internet but still don't understand it. I was wondering this because when there are more than one inputs in a transaction, all the adresses start by 3. Why?

Submitted July 12, 2017 at 03:49PM by ph1d0w
via reddit http://bit.ly/2udHdb9

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