Okay kiddo, so embryo space colonization means sending tiny little baby cells into space and letting them grow into full grown humans or other creatures in a new space habitat.
Imagine planting a tiny seed in a pot and watching it grow into a big plant, but instead of soil, we use a special container called a "bioreactor" that has everything the cells need to grow and thrive.
Once the cells have grown into bigger organisms, they can then live and explore in a new space habitat. This is a way to expand our human race beyond just living on Earth and explore new worlds.
It's still in the early stages of research, but scientists are working on developing the technology to make this possible. It's a pretty exciting idea!