Okay kiddo, so you know how history is the story of everything that happened in the past, right? Well, post-classical history is a part of history that happened after the fall of the Roman Empire in 476 CE (that's a really long time ago!).
A lot of changes happened during post-classical history, and it lasted for about a thousand years, until the discovery of the New World by Christopher Columbus in 1492. During this time, new empires rose and fell, new religions emerged, and people started to explore the world more.
One of the biggest changes that happened during post-classical history was the rise of Islam. This religion started in the 7th century in what is now Saudi Arabia and quickly spread across the Middle East and North Africa, and even into Europe. It became a major world religion, with millions of followers today.
Another big change during post-classical history was the rise of new empires, like the Byzantine Empire in the east and the Holy Roman Empire in the west. These empires had different cultures, religions, and languages than the Roman Empire, but they still had a big impact on the world around them.
People also started to travel more during post-classical history. Explorers like Marco Polo traveled from Europe to China and brought back tales of new lands, cultures, and technologies. This led to an exchange of ideas and goods between different parts of the world.
In a nutshell, post-classical history is all about the changes that happened after the fall of the Roman Empire. It was a time of new religions, new empires, and lots of exploration and discovery.