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A Pod is the smallest deployable unit in Kubernetes that can contain one or more containers. A ReplicaSet ensures that a specified number of pod replicas are running at any given time, maintaining availability. A Deployment is a higher-level abstraction that manages ReplicaSets and provides declarative updates to applications, allowing for easy scaling and rollbacks.

A kubelet is an agent that runs on each node in a Kubernetes cluster. Its role is to manage the containers on that node, ensuring they are running as specified in the Pod specifications, monitoring their health, and reporting back to the Kubernetes control plane.

A DaemonSet is a Kubernetes resource that ensures a copy of a specific pod runs on all (or a subset of) nodes in a cluster. You would use it when you need to run a background service or process on every node, such as logging agents, monitoring tools, or network proxies.

To secure a Kubernetes cluster, you can implement the following measures:

1. **Use Role-Based Access Control (RBAC)**: Define roles and permissions to control access to resources.
2. **Enable Network Policies**: Restrict traffic between pods using network policies.
3. **Use Pod Security Policies**: Enforce security contexts for pods to control their capabilities and privileges.
4. **Secure etcd**: Encrypt etcd data at rest and use TLS for communication.
5. **Limit API Server Access**: Restrict access to the Kubernetes API server using firewalls and authentication mechanisms.
6. **Regularly Update Kubernetes**: Keep the cluster and its components up to date with security patches.
7. **Use Image Scanning**: Scan container images for vulnerabilities before deployment.
8. **Enable Audit Logging**: Monitor and log API requests for auditing purposes.
9. **Implement Secrets Management**: Use Kubernetes Secrets to manage sensitive information securely.
10. **Isolate Cluster Components**