It isn't necessary to make a different website for mobile users, Webpage Templates can be very responsive to what device they are being viewed on.
When Viewed on mobiles Webpages rearrange their Atoms from being in a Table format to being in a List format. For example:
Atom 1, Atom 2, Atom 3
Atom 4, Atom 5, Atom 6
Atom 7, Atom 8, Atom 9
becomes
Atom 1
Atom 2
Atom 3
Atom 4
Atom 5
Atom 6
Atom 7
Atom 8
Atom 9
You can also configure atoms to be hidden on mobile to give you more flexability with what is shown.