Architecture where multiple systems run simultaneously and share the workload. Like having two engines powering one plane at the same time.
Global websites use active-active configurations across multiple regions so if one data center fails, the others handle all traffic seamlessly.
Active-active is an architecture pattern (not a single cloud service) where two or more environments run at the same time and share production traffic. Cloud services commonly used to build it include global load balancing (to distribute users), multi-region databases (to keep data available), and DNS health checks/failover (to route around outages).