RNA polymerase is a term used in molecular biology and can be abbreviated as RNAP. RNA polymerase refers to an enzyme that manufactures RNA from a DNA template. RNA polymerase uses the enzyme helicase to locally open the DNA that is double-stranded in order to use a strand of the exposed nucleotides as a template for the synthesis of RNA. This is a process described as transcription.
Hence, we can say RNA polymerase performs a template-directed sequence through the transcription process. Before RNA polymerase can start the DNA unwinding at the position, there must be an attachment of a transcription factor as well as the transcription mediator complex associated with it to a promoter.
A promoter can be explained as a DNA binding site. RNA polymerase also facilitates elongation and attachment, guides the positioning of the nucleotides. It, as well, has termination recognition capability, replacement capabilities, and intrinsic proofreading.