If you host it in a VPS environment, your site won't share resources with neighboring sites, the way it would with shared hosting. In fact, your site lives in a partitioned server area that has its own operating system, storage, RAM, and monthly data transfer limits, so you can expect smoother, more stable site performance. The sites with which you share your server are far less likely to affect your site—or even take it down altogether—than they would be on a shared site. Knowing how VPS setups operate is just the first step, however. You still need to familiarize yourself with the essential features needed for building a rock-solid, VPS-hosted website.
A virtual server and a dedicated server differ by the number of users that possess resources on a physical server. With a virtual private server, some of the resources are isolated for individual users, but there are multiple users on the same physical server. With a dedicated server, a single user has access to all of the resources of a physical server.