The web and server hosting world is full of abbreviations that look as though they were designed to confuse inexperienced hosting clients: IaaS, PaaS, SSD, SSL, VPN, VPS, and many more. It’s especially confusing when abbreviations are similar, but mean completely different things, as is the case with VPN and VPS. I’ve often heard hosting clients say VPN when they mean VPS, and vice versa.
cPanel and WHM give you all the power you need when managing multiple sites, domains and clients. Create as many cPanel accounts as you need within WHM's account dashboard, assigning the cPanels to each respective property. Once set up and assigned, you can view usage, manage account stats, modify, upgrade or suspend accounts and much more. This allows you to manage your server exactly how you want it, including splitting your clients up for billing, resource and support purposes.
Way of using resources In the case of shared hosting, websites and / or applications residing on the server make use of resources and available server capacity at the same time. In the case of VPS hosting, each websites and / or applications residing on the server is being allotted a virtually distinct server.  Here a separate, exclusive server is often rented.
The force driving server virtualization is similar to that which led to the development of time-sharing and multiprogramming in the past. Although the resources are still shared, as under the time-sharing model, virtualization provides a higher level of security, dependent on the type of virtualization used, as the individual virtual servers are mostly isolated from each other and may run their own full-fledged operating system which can be independently rebooted as a virtual instance.
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