Question

write the difference of formal letter and in formall letter .....

Answer 1

Formal letter is an official letter which is written to managers, officials, principals, etc.
Informal letter is an unofficial letter which is written to family members, parents, siblings, friends, girlfriend, etc

Answer 2

simply basic difference between formal letter and informal letter is that

formal letters are written for the purposes of appreciation , invitation, or for request but

informal letter are for the purposes of complaining,observation, and for ordering

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