I will try to give as much information in the clearest way possible.
First of all, if you hadn't already guessed, most of the movie type stuff is a bunch of bull
vampires are not immortal, they do not burn up in the sun, they don't have fangs,
they are not repelled by garlic or crucifixes,
they don't sleep in coffins(unless really into that kind of excitment), etc. Vampires are essentially human
they have human weaknesses and fears.
They are kind of just a more intense version of human beings.
The Vampire In The Beggining
There are different theories on where vampires come from.
Some sources say that the vampire trait is part of the individual's
DNA; they liken this genetic difference to a viral imperfection of
some kind. In this way, it is said that a vampire can make others of
his kind if a blood exchange is passed between him and his "victim";
the person will ingest the virus and slowly take on the characteristics
of a vampire. Others say that the vampire trait is inherited,
and that a vampire cannot make another of his kind. One particularly
interesting theory is that of the "psi" vampire; this is the soul of
a vampire that cannot accept the fact that his physical form is dead,
and the soul invades the body of an infant at birth, therefore giving
the vampire a new physical form. Thus, the child will grow up as a
vampire, although he will probably not remember what happened to him.
It is thought that psi vamps go through many bodies, and therefore
have many vague memories of past lives. For reasons they cannot
explain (because they usually have no immediate recollection of their
other "lives"), they feel like an "old soul."
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