Docker

Docker is a software development platform used to deploy applications
Applications are packaged in containers that can be run on any operating systems
Since application are containerized, they run the same regardless of the underlying OS
Docker containers do not interact with each-other as long as we do not make them to do
One faulty application may bring down one container, other containers will stay intact
Since multiple containers can run on the same host machine, we are able to scale them horizontally

Container Registries

Docker images are stored in Docker Repositories also name Container Registries
Example of container registries: Docker Hub, Elastic Container Registry (ECR), etc.

VM: virtual machines are running on the hypervisor
Container: resources are shared with the host (no hypervisor) => many containers can run on the same host