Difference between zygote , embryo and foetus

Zygote is formed just after fertilization.
When zygote embedds itself on uterus wall, then it is called embryo.
When embryo develops body organs like hands legs etc. , then it is foetus.

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An embryo is the early stage of human development in which organs are critical body structures are formed. An embryo is termed a fetus beginning in the 11th week of pregnancy, which is the 9th week of development after fertilization of the egg. A zygote is a single-celled organism resulting from a fertilized egg.