In terms of web hosting the control panel is usually a part of the web hosting services provided by the web hosting provider. It is a web-based GUI interface that allows clients to manage their web hosting services such as: bandwidth, e-mail accounts, FTP accounts, databases and so on. Such control panels are: cPanel; Plesk; Directadmin and many others. ETNHost provides cPanel FREE for the following services: Shared Hosting; Reseller Hosting; Enterprise Hosting and at additional cost for the Virtual and Dedicated Servers.
There are commercial and free server control panels and they can be installed independently on a regular dedicated or virtual server without buying additional web hosting services.