several people can use a UNIX computer or LINUX at the same time.multiple users can access system resources like memory/application programs at same time.
A user can run multiple programs or application at the same time.
Linux source code is freely available and it is community based development project multiple teams can work in collaboration to enhance the capablity of Linux Operating System.
Protablity means software can work on different type of hardware in same way.Linux Kernel and application programs support thir installation of any kind of hardware platform.
Linux provides a standard file structure in ehich system file/user files are arranged
Linux provides a special interpreter program ehich can be used to execute commands of the operating system.it can be used to do various type of operations,call application program etc.
Linux provides user security using authentication features like password protection,controlled access to specific files/encryption of data.
There are many protocols available in the latest development of linux kernels include TCP,IPv4,IPv6,AX.25,X.25,IPX,DDP and More..