Docker is a Containerization platform for packaging, deploying, and running applications as CONTAINERS.
Containerization is a lightweight form of virtualization that allows you to encapsulate an application and its dependencies into a self-contained unit called a "container."
Docker applications run in containers that can be used on any system: a developer’s laptop, systems on premises, or in the cloud. (it runs the same)
Containers share the host operating system's kernel, but they have their own isolated file system, processes, and networking.
| Aspect | Containers | Virtual Machines |
|---|---|---|
| Resource Usage | Lightweight, efficient | Heavier, more resource usage |
| Startup Time | Quick start | Slower start |
| Isolation | Process-level separation | Full OS isolation |
| Portability | Highly portable | Compatibility concerns |
| Resource Overhead | Minimal overhead | Higher overhead |
| Isolation Level | Lighter isolation | Stronger isolation |
Learning Resource:
Containers vs VM - Difference Between Deployment Technologies - AWS