What makes Linux different from traditional Unix
GNU Public License (GPL) for the Kernel and OS applications:
free to use; get the source; develop and disclose your source.
The same Kernel and GNU C libraries (glibc) for different distributions:
if you can run an application on one kind of Linux, its a matter of setting
libraries to run it on the other distribution.
Runs on various computer architectures: x86, ARM, POWERPC, SPARC, ALPHA, MIPS, HPPA, etc.
The fastest developing OS.
Various vendor support.
Strong community support.
Why would you run Linux?
Available free kernel, modifieble for specific tasks.
Vendors can easily port their software into Linux, for example, file systems.
Various developers can work on the same software without
intellectual property issues.
Open source software allows upgrading and changing software by the people
No license fee for every version of the software on any computer - no charge for scalability.
It is your choice what commercial software you need to buy.