A cover letter is a single-page letter that should be part of any job application. The only time a cover letter should not be included is when a job ad clearly says to NOT include one. At all other times you should include a cover letter. You might be applying for a specific, advertised job, or you might be contacting a potential employer to see if they have any vacancies. Either way, your cover letter needs to: Introduce you Mention the job (or kind of job) you're applying for (or looking for) Match your skills and experiences with the skills and experiences required by the job Encourage the reader to read your resume Finish with a call to action (e.g., requesting an interview or asking to meet) Here is the Professional Cover Letter Design for Software Testers, Dear Human Resources Hiring Professional, As a highly dedicated and skilled Software Tester, I read your posting for a new Software Tester with interest. My experience aligns well with t...