Persian language was once very important and widely used in the Indian subcontinent (which includes places like India, Pakistan, and Bangladesh). It was used by kings, scholars, and traders who came from Persia (which is now called Iran) and other nearby places.
Persian was a bit like a magic code that allowed people who spoke different languages to communicate with each other. It was also seen as a very fancy and sophisticated language, so people who knew how to speak Persian were highly respected.
Over time, Persian language became an important part of Indian culture. People started using it in books, poetry, and even in everyday conversation. Many important historical documents and literary works were written in Persian in the Indian subcontinent.
Even though not as many people speak Persian in the Indian subcontinent nowadays, it still has an important place in the region's history and culture.