Question

define formal letter and informal letter

Answer 1

A formal letter is a letter, written in formal language, in the stipulated format, for official purpose.Written in prescribed format only. 

.A letter written in an friendly manner, to someone you are familiar with, is called informal letter. No prescribed format

Answer 2

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Formal letter-:are letters written to peoples who donot know a personal level.

Eg.we may write to find out information ,to apply job,to make a complaint,etc.

Informal letter-:An informal letter is a letter you would write to a friend,a family member or an acquaintance.The classic informal letter has five part as follow-:

Address block: Includes your return address and date of writing letter.