Though there are many misconceptions including, they look exactly the same, even act alike and have the same interests, you could say a clone!
Parents of identical – monozygotic twins know better, and being a mother of identicals this is far from the truth.
Mono-zygotic twins are basically two babies produced from one embryo (one egg and one sperm), this embryo divides in half creating two of the same sexed babies. Their DNA is the tell tale way of knowing 100% that they are identical. Sharing a placenta and/or amniotic sac, or twin to twin transfusion syndrome can also be indicators.