Passage of an organism through cleavage, morulation, blastulation, and morphogenesis as well as, in many cases, also gastrulation, organogenesis, larval formation, and metamorphosis.

The following video is an introduction to animal development but, alas, it gets its definition of gastrula wrong:

See also development, embryonic development, morula, blastula, and grastrula.

This video pushes things further than the first, and is totally awesome!