Structure of Linux OS ?

In Linux the file system is based on one root directory, or hierarchical top point with sub-directories below it. In which each sub-directories has its own importance like some act as mount points, some for log messages, some for all hardware devices etc.
You can find a brief description of all the directories and sub directories below

• You can find a brief description of all the directories and sub directories below:

/ :-         Its the top most directory in any of the Unix based system.
/bin:-     Essential command binaries that need to be available in single user mode; for all users, e.g., cat, ls, cp.
/boot:-   Boot loader files, e.g., kernels, initrd etc.
/dev:-    Information of all the hardware devices.
/etc:-     All the config files.
/home:- Home directories of all the users in a particular machine.
/media:-Mount points for removable media such as USB, CD etc.
/mnt:-    For temporary mount points.
/opt:-     Optional software packages like openoffice etc.
/root:-    Home directory of root user.
/sbin:-    System binaries like init, ip etc.
/tmp:-     Temporary files. Often not preserved between system reboots.
/var:-      Variable files—files whose content is expected to continually change during normal operation of the system—such as logs, spool files, and temporary e-mail files.
/usr:-      Secondary hierarchy for read-only user data; contains the majority of (multi-)user utilities and applications.
/lib:-        Libraries essential for the binaries in /bin and /sbin.