what do i want to know about genetic material of DNA

I want to know a lot of things about DNA .

-what is the meaning of the name?

-what are the component of DNA?

-how the matterial is keeped through of generations?

-Why do we have DNA?

- Where is the genetic material of DNA?

what do i know about DNA?

I think that DNA is the tipe of blod that the people have.
some persones have the same blod of her familiit is good because if a person of my family have my same blood i can give blood tu her,and if i have an axident and a person have my same blod he/she can give to me some of her blod.
In the world are diferents tipes of blo: A positive, a negative, b positive, b negative, ETC