Hybrid refers to a genetic cross between two or more different strains. It can happen unintentionally or randomly, but is typically done to combine the desired traits of the original plants to make strong combinations. Today, most of the strains found in the market or cannabis dispensaries are a form of hybrid.
Often, hybrids provide a balanced combination of sativa and indica effects. The names sativa, hybrid, and indica are part of popular cannabis taxonomy, and they predate modern chemical quantification of the cannabis plant. They continue to be useful to cannabis breeders, cannabis growers, and consumers, but provisions are often not similar or representative.