Describe your experience using Docker for containerizing applications.

I used Docker to package applications and all their dependencies into containers, which allows them to run in an isolated environment on any machine with Docker. This significantly simplifies deployment and scaling of applications.

For example, I created a Dockerfile for a Node.js web application, where I specified the base image, copied the source code, installed dependencies, and set the startup command. Then I built the image and ran the container locally and in a testing environment.

I also used Docker Compose to run multiple services simultaneously (for example, an application + database), which made local development and testing easier.