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What is a container in software?
A container is a small, sealed package that holds an app and everything it needs to run.
- Category GitHub & code
- Also called containers
- Updated 20 Oct 2026
Container, explained simply
A container keeps an app apart from the rest of your computer. That avoids clashes with other software.
It also means the app behaves the same on any machine that can run containers.
Think of a shipping container. What is inside stays the same wherever the box travels.
Docker is the best-known tool for making and running containers.
On ITG Now, our free tool guides mention containers when a tool ships as a ready-to-run package.
Related terms
DockerVirtual machineSandboxSelf-hostingCloud computing
Where you'll see it on ITG Now
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- GuideHermes Agent: Free Self-Improving AI Agent (2026 Guide)
Questions people ask about Container
Container vs virtual machine: what is the difference?
A container shares your computer's core system, so it is lighter. A virtual machine runs its own full system.
Is a container safe?
It adds a layer of separation, but it isn't a perfect wall. Only run containers from sources you trust.
Do I need containers to use AI tools?
No. Some tools offer a container option because it makes setup easier.