An appointment letter is a document that the business sends to a prospective employee formally designating them as such. It occurs following the candidate’s acceptance of the employment offer and his appointment as an employee. Usually, this letter is given to the employee on their first day of work. It offers details about the position being offered, the pay and benefits that come with it, the different corporate policies, and other employment-related information. The employee must sign the copy of the letter and send it back to the company.