It is very important that the system is shutdown properly. Simply turning the power off can cause serious file system damage. While the system is on, files are in use even if you aren't doing anything.Remember that there are many process running in  the background all the time. These process are controlling the system and keep a lot of files open. When the system just gets powered off, these files are not close properly and become damaged. Depending on what files become damaged, the system might be permanently damaged. In any case, you'll have to go through a long file system check procedure on the next reboot.
So, when you go to reboot or power down your computer, it is important to do so the right way. There are several ways of doing this, you can pick whichever one you think is the most fun. Most of the ways for turning off the system can also be applied to rebooting.......
so, you properly shut down the computer system......
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It is important to shut down your computer properly because if you simply turning the power off with the power switch can cause serious file system damage. when your system is on, the files are even if u aren't doing anything. remember that there are many processes running in the background all the time. these processes are managing the system and keeps a lot of files open. When the system power is switched off, these files are not closed properly and may become corrupted  
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