The Indian Postal System uses a six-digit numeric number called a PIN code, also known as a Postal Index Number, which is often found at the end of any address in India. Finding the correct person or location can be a little difficult for the Indian Postal Service due to the size of the nation and the sheer number of villages, towns, and cities. Thus, the India Post introduced the six-digit PIN code number to make the delivery of packages or mail more effective.