A business letter is a formal written communication used in professional settings. It typically follows a specific format and is used to convey information, requests, or responses between individuals or organizations. Common types of business letters include cover letters, inquiry letters, and complaint letters. These letters are important for maintaining professionalism and clarity in communication. They often include elements such as the sender's address, date, recipient's address, salutation, body, closing, and signature. Properly written business letters can enhance relationships and facilitate effective communication in the workplace, making them essential tools for business professionals.