Final answer:
An apology letter is written in response to a complaint. It acknowledges the issue and often offers an explanation or solution. The letter should be professional, and sincere, and include all the standard parts of a business letter format.
Step-by-step explanation:
The type of letter written in response to a complaint is called an apology letter. An apology letter serves to acknowledge the receipt of the complaint, address the issue, and often includes an explanation or a solution to the problem. The structure of a business letter includes the date, sender's address, recipient's address, a proper salutation, the body of the letter explaining the situation, and a formal closing.
When composing an apology letter, it is essential to be sincere and to provide a clear statement of regret for any inconvenience caused. The tone should be professional and the response should be timely, as this may greatly affect the sender's reputation and relationship with the recipient. The closing of the letter typically is "Sincerely," followed by the sender's signature and typed name.