Hybridization is defined as the crossing of two varieties, species or genera with desirable raits and bringing together these traits in their progeny. Somatic hybridisation is a process of obtaining hybrids by fusion of protoplast in vitro.
Natural pollination is transfer of pollen grain from anther to stigma of a female flower by a natural agency like air, animal.
Artificial pollination is transfer of pollen grain from anther to stigma of a female flower by a artificial method like by a man.