Docker is a platform that enables developers to automate the deployment of applications inside lightweight, portable containers. Containers package an application with all its dependencies, ensuring consistency across different environments.

Docker Compose is a tool for defining and running multi-container Docker applications. With Compose, you use a YAML file to configure your application's services, networks, and volumes, and then use a single command to start everything.

• Docker installed on your machine
• Docker Compose installed on your machine

• Container: A lightweight, standalone package that includes everything needed to run a piece of software (code, runtime, system tools, libraries, settings).
• Image: A snapshot of a container. Images are used to create containers.
• Dockerfile: A script containing a series of instructions to build a Docker image.
• Docker Hub: A cloud-based repository for sharing Docker images.

• docker --version: Check Docker version.
• docker pull <image>: Download an image from Docker Hub.
• docker build -t <image-name> .: Build a Docker image from a Dockerfile.
• docker run <image>: Create and start a container from an image.
• docker ps: List running containers.
• docker stop <container-id>: Stop a running container.
• docker rm <container-id>: Remove a stopped container.
• docker rmi <image-id>: Remove an image.

• Service: A definition of a container in the Docker Compose file.
• Network: The communication layer between containers.
• Volume: A persistent storage mechanism for container data.

• docker-compose --version: Check Docker Compose version.
• docker-compose up: Start up all services defined in docker-compose.yml.
• docker-compose down: Stop and remove containers defined in docker-compose.yml.
• docker-compose build: Build or rebuild services defined in docker-compose.yml.
• docker-compose logs: View logs for services.

Here’s a basic example of a docker-compose.yml file for a web application with a database:

version: '3'
services:
  web:
    image: nginx
    ports:
      - "8080:80"
  db:
    image: postgres
    environment:
      POSTGRES_USER: example
      POSTGRES_PASSWORD: example