Since the files in /usr are not related to a specific computer and will not be modified in normal use, this directory (file system) can be shared over the network. In this way, when the administrator installs new software, all people sharing this File system computers are available using the new software.
A typical /usr directory is as follows:
/X11R6 stores the X window system
/bin stores added user programs
/dict stores dictionary
/doc stores additional documents
/etc stores configuration files
/games stores games and tutorial files
/include stores header files for C development tools
/info stores GNU information files
/lib stores library files
/local stores added applications generated locally
/man stores online help files
/sbin stores added management programs
/share stores structured independent data
/src stores the source code of the program