RTO aka Return-To-Origin, it is the process after a delivery is failed, in this a product never reaches the consumer due to multiple reasons, hence it is returned back to the sellers.
The following are a few common reasons for RTO:
a) Incorrect Delivery Address
b) Unavailability of the Recipient
c) Damaged Goods
d) Unsatisfied Customers
e) Shipping and Handling Errors
f) Failed Delivery Attempts
g) Customer Cancellations