Definition - What does Hybrid mean?
A hybrid plant or strain is a unique variety of plant that is produced by cross-pollinating two related species. Due to its uniqueness, a hybrid plant is unable to reproduce itself.
Hybrids are quite popular in the cannabis industry, when growers cross-breed sativas and indicas, for example, but are common in general agriculture crops as well. In fact, almost any two compatible species can produce a hybrid.
MaximumYield explains Hybrid
Most often, a hybrid plant is the result of the intentional breeding of two or more varieties to produce a superior offspring to the parent plants.
Hybrids can be produced to have a different growth habit, tolerate harsher conditions, or, specifically in the case of marijuana plants, to produce a more favorable/desirable high.
Cross-pollination with a variety of species can result in a hybrid with positive characteristics of all parent plants. In other words, a hybrid has characteristics from both parent plants. For example, a sativa strain can be bred with an indica strain. The resulting hybrid strain will have a slightly different growth pattern than its parents, as well as produce a different high than each of the parent breeds/plants.
In cannabis culture, a hybrid strain is often described as being "sativa-dominant" or "indica-dominant". This is important for medicinal users who are looking for a particular outcome from ingesting the hybrid.
As with all hybrids, the seeds of hybrids cannot be saved and planted because they are sterile. To get around this, hybrid varieties are instead propagated through cloning a leaf or stem cutting.