cPanel (control Panel) is a graphical web-based web-hosting control panel, designed to simplify administration of websites. cPanel handles aspects of website administration in its interface. The software is distributed by cPanel Inc. and is proprietary, it is designed for use by commercial web hosting services and requires monthly license fees.
cPanel runs on Redhat Enterprise Linux, CentOS, and FreeBSD, there is also a beta version available for Windows Server 2008 which has not been released yet.
cPanel and WHM allows your business to work on all levels. With four levels of access, you and your customers have access to the tools they need 24x7x365, from anywhere they have access to the internet.
WebHost Manager (WHM) [Server Administrator Login]: From WHM, you can provision accounts, tweak security settings, install addon software, and much much more. This interface provides access to the heart of the cPanel and WHM package and allows a Server Administrator to simply configure a few options and be on their way to hosting web sites.
WebHost Manager (WHM) [Reseller Login]: Resellers also get limited (configurable) access to WHM to create new domain owner accounts, backup accounts, and access to many other tools as determined by the Server Administrator.
cPanel [Domain Owner Login]: Within cPanel, a domain owner has all the tools they need to create an impressive web presence. They can add mail accounts, access their files, use website builders, add a blog to their site, and a whole lot more. With cPanel, your web hosting clients have access to a huge variety of hosting features that can put your hosting business, and their web site, on the map!
Mail [Mail User Login]: Every person who has a mail account on a cPanel domain has access to webmail, spam filtering, message filter, and many more settings so they can get a great mail experience.