What is the difference between Docker and Kubernetes?

Docker is a platform for creating, deploying, and running applications in containers. A container contains the application and all its dependencies (libraries, system tools, etc.), making it portable across different environments.

Kubernetes (K8s) is a container orchestration system. It automates deployment, scaling, management, and automatic recovery of containerized applications. Kubernetes manages groups of servers (a cluster) where containers are run.

Main differences:

Aspect	Docker	Kubernetes
Purpose	Containerization (creation and running)	Orchestration (container management)
Level	Single-node (for one host)	Cluster-level (for a group of hosts)
Functions	Creating images, running containers	Automatic deployment, scaling, load balancing, self-healing, storage and network management
Scaling	Manual or basic	Automatic and comprehensive
Fault Tolerance	Limited (at the container level)	Built-in (replication, automatic recovery)

Docker is a tool for packaging applications, while Kubernetes is used to manage these packaged applications in a scalable and reliable environment. Kubernetes can manage containers created with Docker (and other compatible runtimes).