Fraternal twins started from two separate eggs in the mother.
By comparison, identical twins started from one egg but it divided at the first stage of development into two separate zygotes (and thus two separate babies).
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Fraternal twins are twins who develop from two separate fertilized eggs. They can be of the same or different genders and share about 50% of their genetic material. Fraternal twins are also known as dizygotic twins.
Fraternal twins share most of their genetic material, by virtue of having the same parents. Identical twins, however, by definition share 100% of their DNA. This means, for example, that identical twins cannot ever be one of each gender, as fraternal twins often are.
Fraternal twins are more popular.
Another name for fraternal twins is dizygotic twins.
Fraternal twins can be the same sex or opposite sexes. It doesn't matter.
Yes, fraternal twins are perfectly normal.