What is Docker Swarm and how does it provide orchestration?

Docker Swarm is Docker native clustering and orchestration solution. Key features: 1) Service management, 2) Load balancing, 3) Service discovery, 4) Rolling updates, 5) Scaling, 6) High availability. Architecture: Manager nodes control cluster state and scheduling, Worker nodes run containers. Example setup: docker swarm init, docker swarm join --token , docker service create --replicas 3 --name web nginx, docker service scale web=5, docker service update --image nginx:latest web. Benefits: Built-in load balancing, Automatic failover, Declarative service model, Integrated with Docker CLI.