There are thousands of strains of marijuana in the world, but they break down into three main categories: Indica, Sativa and Hybrid.
The classification, sativa, refers to varieties of cannabis that generally have a taller height and thinner leaves than indica.
The classification, indica, is used to denote the area in which the specific strain is cultivated. These varieties of cannabis generally have a shorter height and wider leaves than sativa.
The classification, hybrid, refers to varieties of cannabis that contain traits and characteristics found in both indicas and sativas.