Transcription is the transfer of genetic information from the DNA to the RNA. It is the very first step in the process of gene expression where a certain segment from the DNA is being copied to the RNA with the aid of the enzyme RNA polymerase. The segment of DNA that is being transcribed to the RNA is termed as a transcription unit and is able to encode at least a gene. If the gene encoded is for a protein, the product of the process is called the mRNA or the messenger RNA which would serve as the template for the synthesis of the protein.
