Root or "/" contains operating system and maintentece tools.
/usr contains all commands, libraries, documentation and other files that do not change during operation. (Major applications that come with your distribution of Linux will also be found here)
/var contains files that are modified/changed. log files, lock files, spool directories, temporary files, and man pages.
/home contains all of the user files. This includes the users settings, customized files, documents, data, e-mail, and more.)
/proc contains 'fake' files. These files don't exist on the disk and don't take up any disk space. (ls -l still shows a size) When you view them you are really accessing information stored in memory. These are used to access information about the system.
Parts of root filesystem
/bin--executables (binaries) needed during bootup that might be used by normal users.
/sbin--executables (system binaries) not intended for use by general users (users may still use them, but this directory is not on their PATH).
/etc--system-wide configuration files for your operating system.
/root--the home directory of the system administrator (called super-user or root).
/dev--device files. Devices appear on Linux as files so that hardware is abstracted and it is easy to write to them or read from them.
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