what is meant by ubuntu? where it be used? what is the use?
 

what is meant by ubuntu? where it be used?
what is the use?

http://en.wikipedia.org/wiki/Ubuntu_(operating_system)

Have you bothered to do a google search ?
https://www.google.com/search?q=ubuntu

read the top 10 hits

You really should try to formulate a more descriptive and specific title for your thread.
Also, if you want informative and helpful answers, then you need to compose an informative and specific question.
For example, perhaps you could describe what exactly you would like to use Ubuntu for, and whether Ubuntu would
be good for your intended use. You could also list the hardware that you have and ask whether Ubuntu would run well on said hardware.

In the meantime, check out this very helpful site on getting started with Ubuntu: http://www.psychocats.net/ubuntu/index.php
And welcome to the LQ forums!