Functional gene products - why does the DNA code for RNA?

yes the whole process from DNA to RNA is definitely the synthesis of protein, despite of the fact that the actual recipe of protein is given by DNA the DNA is not able to exit the nucleus for taking direct part in the synthesis of protein, and protein synthesis occurs in cytoplasm as the site for there synthesis ribosomes are located there so the formation of RNA is important and necessary for protein Synthesis as it brings the message from the DNA and ultimately the purpose of RNA is protein synthesis.