Have you ever struggled installing Node, Postgres, or Redis on every new machine?
Docker solves this problem by putting everything inside a magic box.
🐳 What is Docker?
Docker is a platform that lets you package your app and its dependencies into something called a container.
This container runs the same way on your laptop, your teammate’s computer, or a cloud server.
📦 Image vs Container (simple analogy)
Image = recipe 📖
Instructions of what to build and how.Container = dish 🍝
The actual running instance of your app.
👉 One image (recipe) can create many containers (dishes).
❌ Without Docker
- Install Node, Postgres, Redis…
- Handle versions, configs, environments.
- On a new machine → repeat everything.
✅ With Docker
- One command to build an image.
- Run it as a container anywhere.
- Your app works the same everywhere.
🚀 Why it matters
- Consistency: “Works on my machine” disappears.
- Portability: move apps between laptops, servers, or clouds easily.
- Speed: no more long setup steps.
💡 Next: we’ll dive into the difference between an image and a container in detail.
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