Welcome to cruise-Chat! Categories on most ships are simply the location of your cabin inside a grouping (Interior, oceanviw, balcony and suite groupings). A higher category of interior cabin is identical on most ships to a lower category. The higher the Cat, the higher in the ship the deck is, mid-ship on a given deck may also be a higher Cat than fore and aft cabins. Occaisonally a ship will have different sized cabins and the larger will be a premium category. The area where this is most relevent is in the suites. There are mini or junior suites all the way up to Penthouse on most lines, Garden Villa is the top suite on many newer NCL ships. They can be the size of a nice apartment with seperate bedrooms, dining room, living room. A hot tub in the room and/or balcony and access to a private garden area with private pool and more goodies. Talk with a good T/A about what options would be best for your needs and budget. They'll be able to guide you through the various categories, pricing and locations of cabins.