The term "Ancient Civilization" refers to societies that existed in the past, particularly those that were complex and developed enough to be considered as a precursor to modern society. These societies had advanced systems of government, religion, art, architecture, science, technology, and culture, which set them apart from simpler societies or tribal groups. Some notable ancient civilizations include the Egyptians, Greeks, Romans, Chinese, Maya, and Indus Valley people among others. The study of these past cultures helps us understand human history and provides insight into how our modern society has evolved over time.