In today’s Internet age, although the widespread use of correspondence has declined, its importance cannot be denied. Usually when we write a letter, we write the PIN code at the address. But many people are not fully aware of its meaning and purpose. So they write the PIN code, whether it is right or wrong. This PIN code is an English abbreviation. Its full extension is the Postal Index Number. In short it is called a PIN. This helps to keep the letters organized and take them to the destination with ease. The PIN code of any place in India is always six digits. Each digit has one meaning, and it fulfills a specific purpose, such as: PIN-756001. The first digit (7) on the left represents a specific area of the country. The second and third digits (5, 6) indicates a subspace and indicate the route by which the letter will reach the destination. The first three digits (7, 5, 6), mean a ...