Fertilization is the process of combining the male gamete, or sperm, with the female gamete, or ovum. The product of fertilization is a cell called a zygote. Human fertilization is the union of a human egg and sperm, occurring in the ampulla of the fallopian tube. The result of this union, leads to the production of a zygote cell, or fertilized egg, initiating prenatal development. The process of fertilization involves a sperm fusing with an ovum. There are two types of fertilisation:  Internal fertilization is the process when the syngamy (union of male and female gamete) occurs inside the female body after insemination using copulation. In contrast,  External fertilization is the syngamy outside the female body, that is in the outer environment especially in water bodies.