In traditional astrology, Gana Porutham is based on three main Gana groups. These are Deva Gana, Manushya Gana, and Rakshasa Gana. Each birth star belongs to one of these groups, and they represent different natural characteristics and behavior patterns.

By identifying the Gana group of the bride and groom, astrologers study how their personalities and temperaments may interact and adjust with each other in married life.