CloudLinux OS is an operating system designed specifically for shared hosting providers, developed by computer software company CloudLinux Inc. CloudLinux OS is based on OpenVZ kernel and is fully compatible with CentOS/RHEL packages. CloudLinux OS is designed to improve stability and security on server and to optimize its work on account of isolating tenants on server, setting resource usage limits for them, optimizing work with databases etc.
cPanel is a Linux-based web hosting control panel that provides a graphical interface and automation tools designed to simplify the process of hosting a web site. Web Host Manager, or WHM, is a powerful program that allows administrative access to the back end of cPanel.
The CentOS Linux distribution is a stable, predictable, manageable and reproducible platform derived from the sources of Red Hat Enterprise Linux (RHEL). They are now looking to expand on that by creating the resources needed by other communities to come together and be able to build on the CentOS Linux platform.