Indus Valley Civilization is the name for a really old and cool city that used to exist in a place called the Indus Valley a really long time ago. There were lots of people who lived there and their buildings looked different from what we see today. They had big, strong walls and lots of different rooms inside. People who lived there had really interesting ways to do things, like making things out of clay and trading with other groups of people far away. Even though we don't see the Indus Valley city anymore, we can learn about it from the things they left behind, like tools, jewelry and even toys! It's really amazing to think about how people lived a long time ago and how we can learn so much from them.