Production of mRNA involves the process of transcription which involves copying of information from DNA, the the process is followed by RNA splicing which involves the removal of non-coding sequence known as introns.
RNA splicing is similar to watching a television show that is on Netflix. That is; <em><u>In watching a television show on Netflix, you watch segments of the show itself, this corresponds to </u></em><em><u>exons or the coding sequences</u></em><em><u>, and fast forward through the commercials, which are thus like i</u></em><em><u>ntrons, known as the -non-coding sequences.</u></em>
