A cover letter is a short (200-250 words) document that accompanies your CV, with a quite rigid structure and has the layout of a letter. Its goal is to introduce the CV, to bring to attention aspects of your activity that can help your application and are not listed or not presented in the proper light in the CV. In short, its goal is to answer the recruiter's question: "Why should I hire this person?"
Now let’s go down with the structure of the Cover Letter