Procedure to apply for voter ID card

I am looking to apply for a passport. I learnt that we need a Voter ID for identity proof for the same.
Please help me with the procedure to apply for a voter ID- what kind of letter do I have to write and where do I have to submit this letter? Where/ what is the office for this purpose?

Hi Santosh,
Welcome to the community. The Election Commission of India (ECI) will issue a voter id card through your Electoral Registration Officer (ERO).
You will need to find out where your ERO is. Not sure how this works outside of the metropolitan cities - maybe some of our members will have some information.
Regards,
Sid