LinuxBuzz published a step by step guide about installing Docker on Ubuntu 22.04 or 20.04 LTS.
How to Docker on Ubuntu 22.04 / 20.04 LTS (Step by Step)
Docker is considered as PaaS (platform as a service) software which makes use of OS level virtualization feature to spin up containers. In other words, we can say Docker provides container run time environment.
How to Docker on Ubuntu 22.04 / 20.04 LTS (Step by Step)