Servers may use many different operating systems,
but the ones you will most often encounter will be using either Unix or Linux.
There are more than a few.
What others are out there? (note: this page is dated, but it is a good historical comparison)
Evolution of Operating Systems (useful for the historical background)
At the simplest level, an operating system does two things:
- It manages the hardware and software resources of the computer system. These resources include such things as the processor, memory, disk space, etc.
- It provides a stable, consistent way for applications to deal with the hardware without having to know all the details of the hardware.
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