DNA has the shape of a double helix. That’s a fancy way to say that it consists of two strands that each wind around itself like the cord of an old-fashioned phone. Then each strand also winds around the other.
The double helix shape occurs naturally, it does not need any proteins, scaffolding or biological treatment to form.
DNA is not always in the double helix shape. Sometimes it is unfolded and are the strands split. This is necessary to read the genetic code on the DNA and to copy it.
Please remember: the double helix of DNA is a right-handed molecule. It turns right, not left, when in use as genetic material of an organism.