What are Kubernetes Helm charts and how do you manage application deployments with Helm?

Helm is a package manager for Kubernetes that simplifies application deployment, versioning, and management through templated manifests called charts.\n\nHelm Components:\n• Charts: Packaged Kubernetes applications\n• Templates: Parameterized YAML manifests\n• Values: Configuration parameters\n• Releases: Deployed chart instances\n• Repositories: Chart storage locations\n\nChart Structure:\nmychart/\n├── Chart.yaml\n├── values.yaml\n├── templates/\n│ ├── deployment.yaml\n│ ├── service.yaml\n│ └── ingress.yaml\n└── charts/\n\nHelm Commands:\n# Install application\nhelm install myapp ./mychart\n\n# Upgrade release\nhelm upgrade myapp ./mychart --set image.tag=v2.0\n\n# Rollback release\nhelm rollback myapp 1\n\nAdvanced Features:\n• Dependency management\n• Hooks for lifecycle events\n• Testing with helm test\n• Chart signing and verification\n• Custom resource definitions\n\nBest Practices:\n• Use semantic versioning\n• Implement proper templating\n• Validate charts before deployment\n• Use values files for environments\n• Implement chart testing\n• Document chart usage