The primary role of RNA in cells is to act as a messenger between DNA and the synthesis of proteins. RNA is critical for translating genetic information encoded in DNA into the amino acid sequences that make up proteins. During this process, RNA is transcribed from a DNA template and then translated by ribosomes in the cytoplasm. Various types of RNA, including mRNA (messenger RNA), tRNA (transfer RNA), and rRNA (ribosomal RNA), all play distinct but essential roles in ensuring that the genetic instructions are accurately expressed to produce functional proteins necessary for cellular processes.