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What is Docker?
Docker is a free tool that packs an app and everything it needs into one box so it runs the same anywhere.
- Category GitHub & code
- Also called Docker container
- Updated 20 Oct 2026
Docker, explained simply
The box is called a container. Docker lets you run it on your own computer.
That means you skip long setup steps. You start the box and the app works.
For example, a guide might give you one Docker command to run a tool with everything already installed.
You need Docker installed first.
On ITG Now, our free tool guides offer a Docker option when it is the simplest way to run a tool.
Related terms
ContainerSelf-hostingVirtual machineSandboxCLI
Where you'll see it on ITG Now
- GuideOdysseus: Free Self-Hosted AI Workspace (2026 Guide)
- GuideOpenSEO: Free Semrush Alternative, Open Source (2026)
- GuideopenGym: Free Workout Tracker App With No Subscription
- GuideHindsight: Free AI Agent Memory That Learns (2026 Guide)
- GuideOpen Notebook: A Free NotebookLM Alternative You Own
- GuideDeepTutor: Free AI Tutor That Learns From Your Notes
Questions people ask about Docker
Is Docker free?
Docker has free options for personal use, and paid plans for some business use. Check its current terms.
Docker vs virtual machine: what is the difference?
A container shares your computer's system and is lighter. A virtual machine runs a whole separate system.
Is Docker hard for beginners?
Starting a ready-made container is simple. Building your own takes more learning.