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Deployment strategies like Blue-Green, Canary, Rolling Updates, Recreate, and Feature Toggles each offer different trade-offs between downtime, risk, and resource cost. Rolling Updates provide gradual replacement with zero downtime, Blue-Green enables instant switching between environments, Canary allows gradual traffic shifting for real-user testing, while Recreate is simple but causes downtime. Tools like Kubernetes, Argo Rollouts, Istio, and LaunchDarkly provide native implementations. Best practices include having rollback plans, using health checks, implementing monitoring, and carefully handling database migrations.