Twin people refers to a very similar people in terms of face and many physical appearance, Twins are two offspring resulting from the same pregnancy, usually born in close succession. They can be the same or different sex. Twins can either be monozygotic (MZ, colloquially "identical") or dizygotic (DZ, colloquially "fraternal" or "non-identical").
There's several kind of Complications of twin pregnancy such as conjoined twins like in this miraculous twins. or like in this two headed twins
This is several great picture of twins people around the world