Docker has become an essential tool in modern software development. Containers provide consistent environments across development, testing, and production, eliminating the 'it works on my machine' problem.
What is Docker?
Docker is a platform for building, shipping, and running applications in containers. A container packages your application with all its dependencies into a standardized unit.
Your First Dockerfile
A Dockerfile is a text file with instructions for building a Docker image. Let's create one for a simple Node.js application.