Curing takes place after harvesting and drying your bud. It is the delicate process of letting your fresh marijuana air-out versus maintaining its moisture.
Growers cure their bud for a variety of reasons, including preventing mold and increasing the flavor when smoking.
For more information about curing marijuana, view these articles:
More growing process definitions:
Germinating | Seedling | Transplanting | Vegetative stage | Flowering stage | Flushing | Harvesting | Drying | Yield