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Recovery Time Objective
RTO is basically the amount of time it takes for you to recover your infrastructure and business operations after a disaster has struck. The main aim is how quickly we need to recover; this, in turn, can help you on how to prepare for failover as well as telling us more on how much of our budget can be assigned to it.
For example, if our RTO is 3 hours, then we need to invest quite a good amount of money in making sure that the DR region is always ready in case our main region goes down due to disaster. Similarly, if our RTO is 3 weeks, then we need not spend much money and instead we can wait for the failed data center to get back up and resume the operations.