Microsoft Azure Service Fabric is a distributed systems platform for building and managing microservices and containerized applications. It allows building reliable, scalable, and manageable distributed applications. Service Fabric handles tasks like resource management, failover, load balancing, service placement, and upgrades. It supports building stateful and stateless microservices that can be deployed to public or private clouds, VMs, or containers. Service Fabric has been battle-tested for over 5 years at Microsoft.