Farming is when you stay in one area and kill the same type of mobs over and over again hoping for a certain kind of item drop. This is done mostly in rappelz to gain pet cards. Farming is just a matter of luck. Some players can enter an area and be there less than an hour and leave with what they wanted.
For most players, however, it takes a long time to get what you are looking for. So do not get discouraged if you are in the same place a week later and still farming. In Epic 5 the farming game has changed some. Now not only do the mobs you farm drop cards, but all mobs in Rappelz now have a chance to drop taming cards.
To quote Itoki on how the new system works: itoki wrote: Monsters of a tamable type drop empty pet cards that are only their own type.Monsters not of a tamable type drop a specific assortment of pet cards. Low level monsters can drop Panteras, Poultries, and Tortuses.
Mid-level monsters can drop Sirens, Red Pixies, Blue Pixies, etc. High level monsters drop Hawkmen and Salamanders. Very high level monsters drop Angels and Kentas. White Dragon and Cerberus cards ONLY drop from their respective monsters in the new dungeon and one other foe.