What is the differences between embryo and a foetus?

An embryo is the early stage of development in a multicellular organism, specifically from fertilization until about the eighth week of gestation in humans. During this period, the basic structures and organ systems begin to form. After the eighth week, the developing organism is referred to as a fetus, which continues to grow and mature until birth. The transition from embryo to fetus marks a significant phase in development, characterized by more complex growth and differentiation of tissues and organs.