Recovery Time Objective - maximum acceptable time to restore service after a failure. Like setting a goal to reopen a store within 2 hours after any emergency closure.
E-commerce companies set RTO of 15 minutes, meaning they must restore service within 15 minutes of any outage.
RTO (Recovery Time Objective) is a disaster recovery/business continuity target, not a specific cloud service. All major clouds support meeting an RTO through architectures and services such as multi-region deployments, backups, replication, load balancing, and automated failover.