What is Dockerization and Docker images or template ?

DOCKERIZATION
Packaging (app + dependencies) and running an application within Docker container
It provides abstraction over the underlying OS services.
Dockerization is less resource-intensive than VM.





Applications shares the Linux Kernel with the OS running the host machine. 


DOCKER IMAGES
Docker containers are able to run applications inside containers and container works on templated images.

Docker images is a base of containers and based on UFS (Union File Sytem) of linux.

Images can be local or taken from central repository.

Templates are lightweight and its several versions can be managed.