Question

Informal letter format with full explanation?

Answer 1

informal letter means the letter which we write to your mother friend father and relatives. this is known as informal letter.
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Answer 2

An informal letter is a letter that is written in a personal fashion. You can write them to relatives or friends, but also really to anyone with whom you have a non-professional relationship with, although this doesn't exclude business partners or workers with whom you're friendly with either.