If you have ever heard a developer say "well, it works on my machine," then you already understand the problem Docker was built to solve.

What is a container?

A container packages your application together with everything it needs to run — code, libraries, settings — so it behaves the same everywhere. Think of it as a sealed lunchbox for your software.

Containers vs virtual machines

Virtual machines carry an entire operating system. Containers share the host kernel and stay lightweight, which is why they start in seconds.

Your first command

Once Docker is installed, a single command pulls and runs a ready-made image. From there, the world of DevOps opens up — and that is exactly where our DevOps track takes you next.