What is Containerization (Docker)?

Containerization is the practice of carrying everything needed for an application to run (code, dependencies, settings) inside a single package. Docker is the most widely used platform for this approach.

What Does It Solve?

It reduces the "it worked on my machine" problem. Because the container focuses on producing the same behavior in test, staging and production environments.

Why Is It Popular?

• It is lightweight and fast
• It is portable
• It provides isolation
• It simplifies deployment

Example Scenario

If you need to run applications in different versions on the same server (e.g. different PHP versions), the container approach significantly reduces conflicts.