What is the biggest difference between the birth of twins?

The biggest difference between the birth of twins lies in their conception. Identical twins, or monozygotic twins, originate from a single fertilized egg that splits into two embryos, sharing the same genetic material. In contrast, fraternal twins, or dizygotic twins, arise from two separate eggs fertilized by two different sperm, resulting in genetically unique siblings. This difference in origin influences their physical traits and potential health outcomes.