The Incas were a native Peruvian people who lived in the Andes Mountains of South America from the 12th century until the 16th century. They were the largest and most powerful indigenous civilization in the Americas before the arrival of the Spanish. The Incas developed an extensive road system, built impressive cities, and created a complex social structure. They also developed a sophisticated agricultural system, which included terracing and irrigation. The Incas were renowned for their art and architecture, and their legacy continues to influence modern-day Peru.