Request Letter is a letter which is written when you need certain information, permission, favour, service or any other matter which requires a polite and humble request. A request is often found in various other types of letters. An announcement letter is a request letter when it requires your presence for a certain event. Invitation letters and persuasive letters are also types of requests. A cover letter is also a type of request as it is asking to be considered for a post or asking for information about a job. Similarly a cancellation letter, maternity leave letter, friendly letter, love letter, petition letter etc. have requesting tones. A formal request letter is written in a formal writing style, complete with your full details, and the full details of the recipient. A time comes when we all need to ask about something from someone and if we know how to do that then we can easily accomplish what we intend to. Depending upon the objective or motive request letters can be lengthy or short. But they are always specific and direct in their approach. One of the importance of a request letter is that it reduces the pressure on the recipient and saves the sender from embarrassment.