The male and the female reproductive parts produce their respective gamete which fuse together and undergoes several changes to develop into a new individual. This method of reproduction is called sexual reproduction.
The animals that directly give birth to their young ones are called viviparous animals. For example, Human beings, dogs, cats, etc.
Whereas the animals that lay eggs to give birth to their young ones are called oviparous animals. For example, snakes, birds, etc.