The purpose<span> of the </span>cover letter<span> is to introduce yourself to an organization, demonstrate your interest in the company or a specific vacancy, draw attention to your </span>resume<span> and motivate the reader to interview you. Often this </span>letter<span> is the first contact you have with a prospective employer.</span>
i would say you would want to keep what kind of writing your doing in your mind and what is your point you are trying to get across
hope i helped