Multihulls include catamarans (two hulls) and trimarans (three hulls).
The advantage to these boats are shallow draft, speed underway and a lot of liveaboard space. You have almost twice as much space as a monohull.
One of the disadvantages, however, is you will usually have to pay a lot more for a marina slip unless you have a smaller catamaran with a beam of 14 or 15 feet that can fit in some of the larger slips.
Larger catamarans like the one in the photo below will usually require two slips in a marina or will have to be tied off at the end of a tee dock.
By Mike Miller, Copyright 2012-2018 Living-Aboard.com