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A Virtual Private Server (VPS) is a virtual machine sold as a service by an Internet hosting service. A VPS runs its own copy of an operating system (OS), and customers may have superuser-level access to that operating system instance, so they can install almost any software that runs on that OS.
why we need to use them?!
when you try to crack some accounts on your own PC, you need to wait a lot of time and you need fast internet and traffic and more issues
like when you try to user cracking with SentryMBA may this take about 1 day to check all of the passwords! and it's same about VPS cracking!
and also VPS are stronger, faster, and more acceptable that home PC!