A Cover Letter is a general introduction about your qualification and interests in the applied position. It also serves as a way to greet your employers in a polite and formal way. Therefore, a cover letter is necessary but not able to grasp a successful interview for yourself. A resume together with the cover letter will be mostly appreciated for this combination provides more personal particulars to show all your skills and your sincerity. Therefore, extra attention should be paid on preparing a persuasive resume that will successfully grant you an interview with the employer.