Kubernetes and Docker are both tools that are commonly used in the deployment and management of containerized applications, but they serve different purposes.

Docker is a containerization platform that allows developers to package and deploy their applications in a consistent and portable manner. It provides a command-line interface and a set of APIs that developers can use to create, manage and run containers. It also provides a centralized hub, Docker Hub, where developers can store, share and distribute their containers.

Kubernetes, on the other hand, is an open-source container orchestration system. It is designed to automate the deployment, scaling, and management of containerized applications. It provides a way to orchestrate Docker containers and manage them at scale. Kubernetes provides a number of features that make it useful for managing containerized applications at scale, including automatic scaling, automatic failover, load balancing, self-healing, Namespaces, and configuration management.

In summary, Docker provides a way to package and distribute your applications, while Kubernetes provides a way to manage and orchestrate those containers in a cluster, creating a unified architecture across multiple containers and host machines.