The relationship between cover letter and resume in our business world is so stronger than the past times. If you are applying for a job, you should support your application with a cover letter. In professional life, the cover letters became an indispensable part of resume. The resume contains your general info, specialities, education and job experiences of staff candidate, so the cover letter will also contain career goals, past experiences and general promotion of candidate. The assessment criterias may change company to company, but generally they prefer a professionally prepared cover letter and resume in the job application process.