Answer :

tami
  An informal letter is which we write to our friends and relatives.
 A formal letter is which we write to someone formal. That is to the principal of your school, your class teacher etc.
informal letter means any letter we write to our friend, mother , brother , sister , father or any relatives
and formal letter means letters like applications which you send to your class teacher of your class, or principal of your school.formal letter means : letter of communication to your superior officer, education minister, appointment order, admission letter etc

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