Classical antiquity was a time long, long ago when some of the most famous civilizations in history existed, like the Greeks and the Romans. It is called "classical" because their achievements in art, literature, philosophy, and science are still studied today and are the basis of many of the things we know and do in the world.
Imagine a time when people did not have the technology and comfort we have now. Even though they did not have modern technology, people in these civilizations were very smart and creative. They invented things to make their lives better, like the Greek democracy and the Roman aqueducts that brought clean water to their cities.
People in those times also believed in many gods and goddesses and they built beautiful temples to worship them. The Greeks built statues of their gods and goddesses that were incredibly detailed and realistic.
Their stories are still being told today, like the story of the Trojan War and the epic poems of Homer. The Greeks and Romans also wrote plays and comedies that are still performed today.
Overall, classical antiquity was a very important time in history for many reasons, but mainly because it laid the foundation for our modern world.