Fraternal and identical twins are different in how they are made and their DNA. Fraternal twins happen when two separate eggs are fertilized by two different sperm, forming two embryos. Because of this, fraternal twins share about 50% of their DNA, just like regular siblings do. They are not more genetically alike than any other brother or sister.
Identical twins, however, happen when a single fertilized egg splits into two embryos. These twins share 100% of their DNA, making them genetically identical. This is why they often look so much alike and have the same genetic makeup.
If you want to know if twins are fraternal or identical, you can use the Journey Genetic Testing Home Twin Zygosity DNA test to get a clear answer.