Bengals are created from a mating between a wild leopard cat and a domestic cat, usually a Mau or a Siamese, though later generation bengals are being used now. The products are known as a fililial generation, or foundation generation, or F generation for short. Hence, a kitten born with one wild parent and one domestic parent would be the first Fililial generation, or F1. That kittens offspring from a mating with a domestic cat would be the second Fililial generation, or F2.
The hybrid offspring are not considered fully domestic cats until they reach the fourth or in some places, fifth generation, when they are then called SBTs, or Standard Bred Tabbies (could also stand for Spotted Brown Tabbies). They are then considered sufficiently removed from the wild and can be shown.
Usually only the females of the F generations are bred. Males have a high rate of being sterile until they reach the SBT level.