You can't receive Indian Rupees sent from outside of the Revolut platform, but you can transfer Rupees to accounts outside of Revolut.
Your INR account lets you keep your money in Indian Rupees, and buy, sell, exchange, and transfer within the Revolut platform. It's a convenient way to manage your money in Rupees if it's the right currency for you, and lets you send to and receive from other Revolut users.