Okay kiddo, have you ever heard of code words? They are words that mean something specific and everyone knows what they mean. Now, imagine that countries also have code words to help people find them easily. These code words are called "ISO codes".
ISO 3166-2:IR is a specific ISO code for a country called Iran. This code word is made up of numbers and letters to make it very unique and easy to recognize. The "3166" part of the code means that it's a code for a country, and the "IR" part means that it stands for Iran.
But, it gets even more specific than that! The "2" in the code means that it's a subcode for a specific region or area within Iran. This helps people find smaller parts of Iran in case they need to know more about them.
So, there you have it! ISO 3166-2:IR is a special code word for Iran that helps people find specific regions or areas within the country. It's just like a special secret code that helps people understand where things are!