Linux File System Hierarchy

/root : Administrator's Home Directory
/home :contain's normal user's home directory.
/boot :contains kernel and files required for booting the system
/usr :contains user related program files.
/bin :contains normal user's executalbe or binary files
/sbin :Contains system administrators executalbes
/usr/bin :Contains normal user's binaries i.e. commands
/usr/sbin :Contains system i.e. system administrators binaries or commands.
/dev :Contains device files
/etc :Contains System's configuration files.
/initrd :Contains Shared Libraries
/Lost+Found : Contains nameless files found during system recovery
/mnt :Contains mount points for floppy drives,cdroms,usb drives and so on.
/opt :Contains third party programs.
/proc :Virtual Filesystem that contains system information providing files
/tmp :Contains Temporary Files.
/var :Contains Log files.
/misc :Used by autofs program.