Several containers such as Linux container, docker container or any of them, they package the application and isolate them from the host. This makes the container faster, reliable, efficient, light-weight and scalable. But apart from being light-weight or scalable containers lead to issues like they could not communicate with each other, containers had to be deployed appropriately, they had to be managed carefully, auto-scaling was not possible with containers, distributing traffic was still challenging.
Kubernetes is an open-source platform for automating deployment, scaling, and operations of application containers across clusters of hosts. Kubernetes is the key component for managing and ensuring the reliability of application deployments in OpenShift 3.