Virtual private servers are built out of a physical server. Each VPS comes with its own copy of operating system and specific server resources.
VPS hosting is a blend of shared hosting and
dedicated server hosting. It gives your website root access and privacy in a shared environment.
A physical server is virtually partitioned into several smaller portions each of which can function independently. A website is not disturbed by the activities of the other websites sharing the server.
Even if a neighbor pulls more resources to meet traffic spikes, your website is not affected. Same way you can scale resources without causing any disturbance to the others. Even if you reboot the server, others will not be affected.
A compromised account will create no risks for your business. You have a
dedicated IP. In shared hosting, the malware spreads across all the accounts.
Even if a neighbor on the server is black-listed, you are safe. In shared hosting, your account also goes offline which means loss in customers and money.
With dedicated resources, risks of slow page loading or server crashing will not be there unless the traffic to your site has increased tremendously and you need an upgrade.
With a VPS, you have the control. You can configure the server any way you want, install software applications of your choice.
You have a totally isolated environment since each website is housed in individual compartments. Access to your area is restricted to those you have given authority to.