The Imperio Azteca, or Aztec Empire, was a Mesoamerican civilization that thrived in the 14th to 16th centuries, known for its advanced social structure, religious practices, and impressive architectural achievements. Centered in the Valley of Mexico with Tenochtitlán as its capital, it was marked by its rich culture and extensive trade networks, which ultimately played a critical role during the Spanish conquest led by Hernán Cortés.