Virtual Dedicated Server / Virtual Private Server

We've all seen this offered around. Some software which allows you to run "multiple machines" on one box. Allows each machine to have it's own root, etc.

I know Plesk offers a software solution, but does anyone know how it's actually done? Is it some funny kernel stuff going on?

How does someone do this without using software? Or what is the software doing?

Thanks

 

 

 

 

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