@WimDecorte @anon45965781
If you have the time...
It's a virtualization technique that allows an application / system to run without actually having to virtualize a whole OS and the application then installed on that OS. So it is a lot more lightweight and thus easier to deploy and maintain.
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Just check out the docker site. 
To really understand it, you'd need to experiment and create a docker container and run it. It's really not difficult.
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and
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Lots of tutorials, here: Docker Java Example - javatpoint
(learn by doing.)
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