You can explain to a potential employer why you are the best candidate for a job by discussing your accomplishments, showing your enthusiasm for the job and giving specific examples of your experience and skills that make you the best person for the position. Be specific but brief, and avoid long-winded answers.
A job interviewer asks a variety of questions to find why an applicant is best for the job and to narrow down the best choices available. The interviewer may ask you specifically why you’re the best candidate for the job, and highlighting actual accomplishments achieved in your career can help sell your reasons. The interviewer may also want to talk about tasks that are similar to the tasks involved in the open position, as employers often want to find someone with prior experience.