Final answer:
A formal letter follows a specific format with sender's and recipient's addresses, while an informal letter has a more relaxed and casual format.
Step-by-step explanation:
The Format of Formal and Informal Letters
A formal letter follows a specific format that includes the sender's address, date, recipient's address, salutation, body paragraphs, closing, and the sender's name. It is usually used for official purposes, such as writing to authorities or organizations.
In contrast, an informal letter has a more relaxed format. It can be written in a casual tone and often begins with a friendly greeting. It may not include addresses or a formal closing. Informal letters are commonly used for personal communication with friends, family, or acquaintances.
Learn more about Formal and Informal Letter Formats