Capping and Splicing
As per Central Dogma, RNA is needed for protein synthesis. RNA formation happens through the DNA by using only the Coding regions of the DNA molecule. As these are the regions which have the information required to code for proteins. The non-Coding part of the DNA is thus, rejected by the RNA. Because the RNA carries information which is only used for protein synthesis, this type of RNA is called as mRNA or messenger RNA.
This happens through Capping and Splicing. This picture below shows the process of transcription in detail.
Three main types of RNA are involved in protein synthesis. They are messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). rRNA forms ribosomes, which are essential in protein synthesis.