Viviparity is a reproductive strategy in which embryos develop inside the body of the parent, leading to live birth. This process allows the developing young to receive nutrients and oxygen directly from the parent, often through a structure similar to a placenta. Viviparity is common in many mammals, including humans, as well as some reptiles and fish. In contrast to oviparity, where eggs are laid outside the body, viviparity provides certain advantages, such as increased protection for the developing young. This method of reproduction can enhance survival rates, especially in environments where conditions are harsh or predation is high.