Starships in Infinite Suns are made up of many components that determine the overall capabilities of your ship. Hulls, Engines, Cargo Bays, Weapons, Sensors, Shileds, Armor, Staterooms, and more.
There are several basic hull types, designed to support specific types of activities.
These ships are generally for mining and processing of ore into minerals
Cargo (trade/transport of goods)
These ships generally cater to trade and hauling. The have lots of cargo area, but not much in the way of creature comforts for passengers
Ferrys (transport of people)
These ships range from bulk people carriers to high class cruise liners. Some customers will pay more for a higher class of travel, while others won't care how they get where they're going, as long as they get there fast. These passengers may even be willing to travel on military vessels.
Military vessels are generally used by pretty much everyone interested in shooting at, or worried about being shot by other ships. Pirates, bounty hunters, police, faction thugs and enforcers. Some of these ships have enough cargo space to make hauling through rough territory worth the effort, others have enough passenger space to make it worth the effort of flying passengers anywhere they want to go (or taking hostages).