What does residential vs commercial address type mean?

so im ordering these AMAZING shoes from
(i found the site on seventeen magazine)
so like while im checking out it said "address type: residential or commercial" what does that mean?
how do i know which one i am?
i live in a house in the u.s.
so which one am i?
kk thanks =)
Update: sorry wasnt sure which category this should have gone in...
Update 2: haha you mean kendra wilkonson!? hahaha i love her!!