What happens in Kubernetes when `kubectl create -f deployment.yaml` is executed? Describe the full chain.

When executing the command kubectl create -f deployment.yaml, the following sequence of events occurs:

1. Sending request to the API server: kubectl reads the deployment.yaml file and sends an HTTP request to create a Deployment object in the Kubernetes API server.

2. Validation and saving: The API server validates the manifest and then saves the Deployment object in etcd.

3. Notification of the Deployment controller: The Deployment controller, running in the controller manager, receives a notification about the new object.

4. Creating a ReplicaSet: The Deployment controller creates a ReplicaSet, which will manage a set of Pods.

5. ReplicaSet creates Pods: The ReplicaSet creates Pods based on the template specified in the Deployment.

6. Scheduler assigns Pods to nodes: The Scheduler selects suitable nodes to run the Pods, considering resources and constraints.

7. Kubelet starts containers: On the selected nodes, Kubelet receives instructions and starts containers via the container runtime.

8. Monitoring the state: Kubelet and controllers monitor the Pods' status, ensuring their readiness and restarting them if necessary.

Thus, the kubectl create command initiates the creation of a Deployment, which through controllers and cluster components leads to the launch of the required number of Pods with your application.