According to International Spa Association, there are seven categories of spas:
1. Hotel and Resort Spa refers to any spas situated in hotels or resorts serving both hotel guests and walk-in guests.
2. Destination Spa is a spa established in its own building which includes recreational areas. Most of its clients will stay overnight, participating in selectable activities like meditation programmes or yoga.
3. Medical Spa means a spa providing medical treatments and utilising medical instruments under specialised personnel's instructions. Generally, this kind of spa is located in hospitals or clinics.
4. Day Spa and City Spa refers to spa services that can be finished at any time during the day. It may take only 30 minutes or one hour. The locations are usually in cities or business centres.
5. Mineral Spring Spa is a spa service at a natural spring which has been developed to be a tourist attraction.
6. Club Spa means a spa combined with a fitness centre.
7. Cruise Ship Spa is a spa service on a cruise ship. This is operated together with useful diet for passengers during the voyage.