You can look it up on google
. Look inside any of the first few results. That being said, I suggest that you install any of the latest distro on your machine. Red Hat Linux is divided into Fedora and Red Hat Enterprise Linux (RHEL). Fedora is the community-developed branch of Red Hat Enterprise Linux. You need paid subscription for RHEL, but if you really want something similar then you can install CentOS
which is exactly the same as RHEL but without Red Hat's support and branding/logos/artwork.
If you don't want Red Hat then you have number of other choices as well:
If you are still unsure, please tell us what your previous experience is with Linux or how you'll be using your machine.