Docker exploded onto the scene in 2013, and it’s been causing excitement in IT circles ever since.

The application container technology provided by Docker promises to change the way that IT operations are carried out just as virtualization technology did a few years previously.

Here are answers to 13 of the most common questions related to this technology.

What are containers and why do you need them?

Containers are a solution to the problem of how to get software to run reliably when moved from one computing environment to another. This could be from a developer’s laptop to a test environment, from a staging environment into production, and perhaps from a physical machine in a data center to a virtual machine in a private or public cloud.

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What are containers and why do you need them?