A request letter is a formal document used to ask for something specific, such as information, permission, or assistance. It typically includes the sender's contact information, a clear subject line, and a polite greeting. The body of the letter explains the request in detail, providing any necessary context or background information. These letters are commonly used in various settings, including business, education, and personal matters. For example, a student might write a request letter to a teacher for an extension on an assignment, while an employee might request time off from their supervisor. Proper formatting and a respectful tone are essential for effective communication.