Viviparous refers to a mode of reproduction in which embryos develop inside the body of a parent, allowing for live birth rather than laying eggs. This reproductive strategy is common in mammals, including humans, where the developing young receive nourishment directly from the mother's body. Viviparity contrasts with oviparity (egg-laying) and ovoviviparity (where eggs hatch inside the body). This adaptation can enhance the survival rate of the offspring by providing a controlled environment during development.