The researchers compared two methods of freezing embryos to see which worked better for helping women get pregnant through fertility treatments. They looked at how many embryos survived the thawing process intact and successfully resulted in pregnancies. They found that using vitrification, a faster freezing process, led to higher embryo survival rates and better pregnancy outcomes compared to slow-freezing. In simpler terms, freezing embryos quickly with vitrification is more effective than the traditional slow-freezing method in helping women conceive through in vitro fertilization.