Well, you seem to know
Windows so let's start there:
It is the operating system by Microsoft, it is the one, that most home users use and it is also the one, that most games and stuff are developed for (maybe after game consoles like PlayStation etc.). Windows is a pre-compiled system, so you install a finished package on your computer and it is supposed to work right from the start. It can NOT be installed on any computer, not Power PCs for example.
The advantages of Windows: It is very common, so probably all your friends have one, this makes it easier to use them, for example for LAN parties etc.
Most applications come out first for Windows (especially games and such, applications for creative work are always released for Macintosh too).
The disadvantages of Windows: It is so common, that almost every virus out there is developed for it, so it is VERY vulnerable and if you surf the internet, you need extra software like Norton AntiVirus and a Firewall.
It costs money.
It is quite unstable compared to other operating systems.
The software that it comes with is quite bad, so a good user will use nearly only third party applications.
MacOS X:This is a quite young system by the company apple, it is based on the first system: UNIX (very stable), but unlike UNIX it has a GUI (Graphical User Interface).
The current version is called OS X Tiger, it is also what I am using. OS X used to only work on special Apple Computers (the ones with the nice Design, iMac, iBook, etc.) but now they're making it compatible to the Intel-architecture too.
The advantages of Mac OS X: Very good look & feel, they invest a lot in design and user friendliness.
It is quite stable, because it is based on UNIX.
There are not that many viruses.
It comes with a lot of very useful applications (iTunes, iPhoto, iMovie HD, iCal, Mail, GarageBand, Safari (Web Browser), that many of the users use, because they are so user-friendly and nicely designed).
If you want to design and be creative (Programming, web-design, photoshoppin', Music mixing, etc.) then you got all apps that you need.
Gamers get satisfied a bit more every day, since Mac OS gets more users, but still there are fewer games available.
The disadvantages of Mac OS X: It is not compatible with all the HOT, NEW stuff like games, periphery etc.
It is quite expensive.
Linux:There are MANY variants of Linux, so you can't really describe
the Linux. The important thing to know: It is available under the GNU license, which means: you can look at the source code, you may change it, you may use it, whatever and it is free (as in speech, but also as in beer). A linux system is not something that you plug in your computer and it justs works, you usually compile your version to fit your needs (there are precompiled version though).
The advantages of Linux: You can adapt it to your needs very easily, it is getting better all the time and it's free. + you can help to improve it.
The disadvantages of Linux: Well, there are near-to-no commercial applications for Linux and GNU-apps are usually a bit behind, because they are, well, free. No real incentive to spend all your time on it, eh.
You have to learn how to use Linux if you are used to Windows.
That's a very summed up version and there are a LOT more sides to the subject and also more OSes but these are the three most common and now you at least have an idea, what the differences are, so you can read on :-)
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