A Sativa is a type of marijuana/plant that will typically produce a euphoric, energetic, cerebral high. and is very hard to grow indoors.

Indica is more of a small, broad, and usually a higher yielding plant that gives you a couchlock body high. Rederalis isn't grown due to its small amount of THC but is sometimes crossed with other species to shorten flowering time.

Hybrid strains can be a combination of any plant varieties and will typically depict phenotypes that are either sativa-dominant, indica-dominant, or equally balanced.