In 1963 Temin(name of the scientist) reported the theory in which certain RNA tumor viruses synthesize DNA, which in turn codes for protein.
It is the process of formation of an intermidiate DNA on the body of a RNA inside the host cell to produce RNA of its own kind.
Generally the process is going on in the body of genetic RNA found in some virus.
The intermediate DNA is produce out , as the RNA do not have the capability to synthesize of its daughter RNA. the RNA is always synthesize out from DNA.
It is somehow reverse of central dogma.