Okay, so you know how sometimes you have a big box of toys and you want to keep them organized, so you make different piles for different kinds of toys? Well, a really long time ago, there were people who lived in a place called Arachosia, which was kind of like a big box of toys, but instead of toys, it was a big area of land.
Arachosia was in what is now Afghanistan and Pakistan, and it was an important part of the world a long time ago because it was a place where different groups of people could come together and trade things like spices, textiles, and animals. But because there were so many different people coming and going, it was important to keep everything organized.
So the people who lived in Arachosia made a system where they divided the land into different areas, kind of like how you might divide your toys into different piles. They had different names for each area, and each one had its own purpose. For example, some areas were for growing food, while others were for trading goods or for people to live in.
Over time, Arachosia changed and was ruled by different people, but the idea of dividing the land into different parts for different purposes stayed the same. So even though we don't hear too much about it nowadays, Arachosia was an important place in history where people learned to work together to keep things organized.