VPS web hosting consists of a server divided into multiple isolated accounts, and each VPS account has its own independent operating system with it's own web server and mail server resources, no sharing here. Just like a dedicated server, you can have access to all configuration files within your account which means a greater ability for you to install and run custom software should you choose to.
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In addition to providing more control over your hosting environment, VPS hosting accounts are more secure than shared hosting accounts. If a hacker were to find access to a shared server he could damage any or all of the websites on that server at once. But because a VPS server is divided into isolated accounts, even if a hacker were to gain entry through one account there is no way to access the others.
