Look up an image:
Explore by theme
multihulls 
Sailboats made out of two or three parallel hulls joined together; the hulls are long, narrow and lightweight so that high speeds can be attained.
trimaran
Sailboat consisting of a central hull stabilized by two smaller hulls on each side (floaters); the hulls are joined by two rigid link arms.
catamaran
Sailboat with two identical hulls that are connected by a rigid structure, which supports a cabin or a deck.
