Okay, so back in a very long time ago in the land that is now known as Pakistan and Iraq, there were two big civilizations called the Indus and the Mesopotamians. They lived very far away from each other, but they knew about each other's existence.
The Indus people lived around the river Indus, which was very important to them because it provided them with water to grow crops and to drink. The Mesopotamians, on the other hand, lived around the two rivers, Tigris and Euphrates, which were also important for the same reasons.
Now, even though they lived far away from each other, they had some interactions. There were some trade activities that took place between them, where they exchanged goods and ideas. For example, the Indus people would trade their cotton cloth with the Mesopotamians for copper and tin. They also traded spices, gold, and ivory, and even had diplomatic relations with each other.
One thing that is interesting about their relationship is that their writing systems were entirely different. The Indus people had a script that we still can't decipher entirely, while the Mesopotamians used a cuneiform script that is well-known to us. It's even more interesting that they never borrowed each other's scripts or writing styles.
Despite this, their relationship was generally peaceful, and they seemed to respect each other's cultures. However, we don't know a lot about it because no written records exist that date back to that time. We only know what we can gather from archaeological findings and some trade items that we discovered.
In summary, the Indus and Mesopotamians were two different civilizations that lived in different geographic areas, but they still had some interactions with each other, such as trade and diplomacy, even though they had different writing systems. We learned this from the things they left behind, but we still don't know everything about their relations.