The term SCI-FI VESSEL can refer to two different types of vessels: a SPACESHIP and a SPACECRAFT. A SPACESHIP is a type of vehicle designed to travel in outer space, while a SPACECRAFT is a vehicle designed to operate in outer space. Both are used for exploration, research, and transportation. Sci-fi vessels are often featured in science fiction stories, films, and television shows. They are usually depicted as having advanced technology and capabilities beyond what is currently available.