The format to write an informal letter is attached here kindly follow it and put the matter of your own whatever you want to write in it, with date, address and salutation.
What is informal?
The term "informal" means a speech or behavior is relaxed and friendly rather than serious.
What is letter?
The term "letter" means a written or printed communication addressed to a person, company, etc. usually sent by post in an envelope.
What is salutation?
The term "salutation" is used in a letter as phrase that is used at the beginning of it, such as 'Dear Sir' or 'Dear Mr. Rodd', etc.
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