can any one tell me what is the diffrence between RHEL and Centos..
diffrences between support,packges,Xwindow,organization funda,
someone say redhat is launch Centos like fedora
but when fedora for beta, RHEL for tested with formal support so why redhat
launch this Centos...
i get some information from net but not sufficiant for me..

Hi,
CentOS is a community maintained distribution that is compiled from Redhat sources to be as close as is possible to the current RHEL release. While Fedora is an upstream distribution maintained by Redhat to develop and test software for RHEL.

If you are looking for a rock-solid distribution with similar characteristics to RHEL, without the support and expense then CentOS is a good choice. If you want cutting edge and do not mind the occasional inconvenience with potentially buggy under-tested software then go for fedora. Hope this helps.

Google it
This has been Answered many,many,many,many times .Over and over.

best info is on http://www.centos.org and their forums. Also http://wiki.centos.org/ and http://en.wikipedia.org/wiki/CentOS