This is when the Ovary releases an egg also known as an Ovum. The Ovum is a reproductive cell that is large compared to other cells.
Ovulation is the journey that the Ovum takes to reach the sperm. It travels down a tube that is known as the Oviduct (or Fallopian Tube). They have tiny hairs attached to the walls of the Oviduct that push the Ovum through the tube as the Ovum moves through it.
From the 200 million sperm that enter the vagina after an ejaculation, only 1000 sperm enter the Fallopian tube. Only then 200 reach the egg but only one enters the egg to fertilise it. The rest die from the acidic fluids, gooey mucus, attacked by the white blood cells or swim into dead-end channels in the cervix.
This crucial stage is where one Sperm has been successful by being lucky and strong enough to penetrate the Ovum's protective layer. Then and only then does that Ovum become fertilised.
Cell division can only take place once the egg has been fertilised. This is when the chromosomes join together to divide into other cells that then eventually form an Embryo.
Implantation is where the recently fertilised egg (the embryo) adheres to the walls of the Uterus. It stays attached to the walls until birth. This provides the developing embryo embryo with oxygen and nutrients from the mother to be able to grow.