This is Part 1 of a complete Docker tutorial series by SRJahir Tech. Before learning commands, files, or tools, we must understand one thing clearly: why Docker exists at all.
Docker was not created to make developers look cool. It was created because traditional software setup was broken in real life.
Imagine this situation:
The most famous sentence in software history was born from this:
“It works on my machine.”
This problem existed because software depends on many things:
One small difference, and the application fails.
Before Docker, teams tried solving this using:
Virtual Machines helped, but they came with heavy cost:
Docker solves one simple but powerful problem:
“Package the application along with everything it needs to run.”
That includes:
All packed into a lightweight unit called a container.
Think like this:
Containers share the host system but stay isolated. This makes them fast, lightweight, and efficient.
Once you understand Docker, environment problems mostly disappear.
Docker is a tool that makes systems predictable.
Do not rush to commands. If you understand why Docker exists, learning how to use it becomes much easier.
In the next part, we will understand: