Vitrification is a method used to freeze mammal embryos. The key factors for success include choosing a safe cryoprotectant, using the right concentration, and considering additives like Ficoll or sucrose. The embryos need to be exposed to the vitrification solution at specific temperatures and times, and then diluted carefully after thawing. Results show that vitrification works well for preserving eggs and embryos of different animal species, with factors like species and embryo stage affecting success. Overall, vitrification is a promising technique for freezing reproductive cells and embryos.