Question

what is in-vitro fertilization in human being

Answer 1

it is an artificial fertilization

Answer 2

In vitro fertilisation is a process of fertilisation where an egg is combined with sperm outside the body, in vitro.
The process involves monitoring and stimulating a woman's ovulatory process, removing an ovum or ova from the woman's ovaries and letting sperm fertilise them in a liquid in a laboratory. 
Then ovum is placed in woman's uterus.