The kubectl cp command is a utility in Kubernetes used to copy files and directories between local systems and containers within pods, or between pods. It requires a compatible version of the K8S API server (v1.14+) and can be useful for troubleshooting, debugging, or data exchange. The command syntax includes source, destination, namespace, pod name, and path parameters. Common errors include unexpected EOF and termination with exit code 126, which can be resolved by checking network configuration, permissions, file existence, container health, and compatibility of the file format with the target operating system. Spacelift offers features to manage Kubernetes infrastructure more easily and securely.