cPanel is a web hosting control panel designed to help website owners manage their sites.
- Uploading and managing web pages;
- Creating email accounts;
- Installing web-based applications like blogs, shopping carts, and forums;
- Backing up data;
- Protecting a site’s content and bandwidth from abuse;
- Generating and viewing statistics about visitors; and
- Reviewing error logs to locate broken links and other problems.
cPanel is commonly accessed via port 2082, with an SSL-secured server operating on port 2083, and supports CentOS, Red Hat Enterprise Linux, and FreeBSD.
whm is developed by the same company and is designed for server administrators and resellers to manage hosting accounts on a web server.
Questions which pertain to getting cPanel itself working, or questions in which cPanel is merely incidental to some other on-topic issue, are generally on topic on Server Fault. However, questions related to how to use it as a user in a quasi-administrative capacity are generally not; see Are cpanel questions really 'professional sysadmin' related?.