What are the differences between Unix and Unix-Like Operating Systems?

Question

Hi. It is such a bad news that sololearn does not contain a shell course.. But I think it is a great platform to ask questions. I just found out that mac, linux and even android operating system is related to unix. But I actually don't know what it is. Google says it is an operating system but what is ubuntu or android then? I also found that mac is a Unix like operating system which is really confusing me. So, it will be very helpful if someone can brief these all together. Thank you in advance.

Answer 1

UNIX is registered trademark. Operating systems built on the same principles are called Unix-like.
Ubuntu is one of the Linux distributions.

https://opensource.com/article/18/5/differences-between-linux-and-unix

Answer 2

Martin Taylor thanks!