So, a long time ago, there were some people who lived in an area called the Pontic-Caspian steppe. They were called the Indo-Europeans because they spoke a similar language that had similar words and grammar. Over time, some of these Indo-Europeans started to move away from the Pontic-Caspian steppe and go to different places.
One group of Indo-Europeans, called the Indo-Aryans, moved to a place called South Asia. They brought their language and religion with them, and over time they mixed with the people already living in South Asia. Eventually, their language became Sanskrit and their religion became Hinduism.
The Indo-Aryan Migration Hypothesis says that this movement of people from the Pontic-Caspian steppe to South Asia happened around 1500 BCE. This is based on evidence like similarities between Sanskrit and other Indo-European languages, and archaeological artifacts found in South Asia from around that time period.
Some people believe this hypothesis is true, while others have different opinions. It’s important to keep learning and exploring different ideas to better understand our history and where we came from.