What is difference between Linux and Unix

Answer 1

You can read about it on Wikipedia.

Answer 2

https://www.cyberciti.biz/faq/what-is-the-difference-between-linux-and-unix/
Difference Between Linux and UNIX – nixCraft
http://www.diffen.com/difference/Linux_vs_Unix
Linux vs Unix - Difference and Comparison | Diffen
https://www.quora.com/What-is-difference-between-UNIX-and-Linux
What is difference between UNIX and Linux? - Quora

https://www.sololearn.com/discuss/821547/?ref=app

Answer 3

nothing except Linux is not certified and trademarked under the Unix brand.