The Aryan Invasion Theory suggests that a group of people known as the Aryans migrated into the Indian subcontinent around 1500 BCE. This theory posits that they brought with them new languages, cultures, and technologies, significantly influencing the existing societies. The Aryans are often associated with the early Vedic texts, which are foundational to Hinduism. However, this theory has faced criticism and debate among historians and archaeologists. Some argue that rather than an invasion, there may have been a gradual migration or cultural exchange. This has led to alternative theories, such as the Aryan Migration Theory, which emphasizes a more complex interaction between the Aryans and the indigenous populations.