Here's a breakdown:

* RNA polymerase is a complex enzyme responsible for transcribing DNA into RNA.

* Transcription is the process where the genetic information in DNA is copied into a messenger RNA (mRNA) molecule.

* The mRNA then carries this genetic information to ribosomes, where it is used to synthesize proteins.

There are different types of RNA polymerase in different organisms, but they all share the same basic function of adding nucleotides to create an RNA molecule.