Types of Cannabis
Cannabis (marijuana, weed, trees, green, flower, etc...) is of the genus Cannabis L., which can be subdivided into the species of Cannabis sativa L., Cannabis indica Lam., and Cannabis ruderalis Janisch.
This species of cannabis is often likened to a sleeping pill. It produces a more sedative high that many refer to as couch-lock. Typically, indica strains will leave you feeling sleepy, relaxed, and hungry with a strong body high. They are great for evening and night-time use. The plants tend to be short and bushy.
Sativas are often described as the coffee of cannabis. Compared to indicas, sativas leave you feeling energized with noticeable cerebral effects that many refer to as a head high. The plants tend to be tall and wiry.
A hybrid is a strain of marijuana that results when you crossbreed sativa with indica. Often, hybrids are bred with other hybrids. Hybrids come in a wide variety and their effects range from indica-dominant to sativa-dominant.
Ruderalis is commonly called hemp. Hemp is non-psychoactive (it won't get you high) but is often prized for their nutrient-dense seeds and as sustainable source for paper products.
Here's an awesome video from our friends at Leafly comparing the differences between Indica, Sativa, and Hybrid: