What is Docker?

Docker is a platform that automates the deployment of applications inside lightweight containers. It enables developers to package applications with all their dependencies and run them anywhere.

Why Use Docker?

• Portability: Run your containerized apps on any machine with Docker installed.
• Isolation: Keep your app and its dependencies in separate containers for consistency.
• Versioning: Use Docker images to version and manage your app's configuration.

Example Dockerfile

FROM node:14
WORKDIR /app
COPY . .
RUN npm install
EXPOSE 3000
CMD ['npm', 'start']

This Dockerfile sets up a container with Node.js, copies your app's files into the container, installs dependencies, and starts the app.