Written to the advert
The job description is read properly and the letter answers what it actually asks for, in the order the employer raised it.
Service
A cover letter is either the most wasted page in your application or the one that explains why you, specifically, for this role. The difference is whether it was written for the advert in front of you.
What you receive
The job description is read properly and the letter answers what it actually asks for, in the order the employer raised it.
Repeating your CV in paragraphs wastes the page. The letter explains the decision: why this role, why this employer, why now.
A UK letter, a Gulf letter and a US letter carry different levels of formality. Yours is pitched for where you are sending it.
Who it is for
Candidates applying to a specific role they care about
Career changers who need to explain the move
Applicants with a gap or an unusual path to address
Questions
Yes, and you are shown exactly which parts to change. The structure and the evidence stay; the role-specific paragraph is rewritten each time.
Not always, and rarely first. But when a hiring manager is choosing between two similar CVs, it is often the only thing that separates them.
By market
Choose your package, your experience level and how fast you need it. The price is shown before you commit.