why should we write pin code of the city in the address - English -

Question

why should we write pin code of the city in the address?

Rajat Jain · Answer

good question
this makes a letter more decriptive,as we know that all places
have been divided into many pin code so that the address of the
receiver is defined and also it becames easy for the delivery of
the letter
i also want to include that it is not necessary to write address
but i suggest u to write it hope it will clear ur doubts