The main aim of a covering letter is to encourage recruiters to read your CV. However, it needs to do a lot more than say, 'here is my CV!' While a CV sets out the skills and experience you have for the job, the covering letter more explicitly demonstrates your understanding of the employing organisation and the nature of the job being advertised.
A curriculum vitae is a self-marketing tool and getting an interview can depend on how good your CV is. Your CV is your chance to show an employer you have the skills and experience needed, and that you are the right person for the job. However, the way you present your CV can have an overwhelming influence over whether your CV is even read, let alone get you that all important interview. You will need to consider what to include, how much detail is needed and how to make your CV stand out from all the others.