Virtual Private Server VS Dedicated Server

Virtual Private Server (VPS)
 is a term used by Internet hosting services to refer to a virtual machine.
The term is used for emphasizing that the virtual machine,
although running in software on the same physical computer as other customers' virtual machines,
is in many respects functionally equivalent to a separate physical computer,
is dedicated to the individual customer's needs, has the privacy of a separate physical computer,
and can be configured to run server software.
Virtual private servers bridge the gap between shared web hosting services and dedicated hosting services, giving independence from other customers of the VPS service in software terms
but at less cost than a physical dedicated server.
As a VPS runs its own copy of its operating system, customers have superuser-level access
to that operating system instance, and can install almost any software that runs on the OS.
Certain software does not run well in a virtualized environment, such as virtualizers themselves;
some VPS providers place further restrictions,
but they are generally lax compared to those in shared hosting environments.
Due to the number of virtualization clients typically running on a single machine,
a VPS generally has limited processor time, RAM, and disk space.

A Dedicated Hosting Service, Dedicated Server,  
or Managed Hosting Service
 is a type of Internet hosting in which the client leases an entire server not shared with anyone else.
This is more flexible than shared hosting, as organizations have full control over the server(s),
including choice of operating system, hardware, etc.
Server administration can usually be provided by the hosting company as an add-on service.
In some cases a dedicated server can offer less overhead and a larger return on investment.
Dedicated servers are most often housed in data centers, similar to colocation facilities,
providing redundant power sources and HVAC systems.
In contrast to colocation, the server hardware is owned by the provider and
in some cases they will provide support for your operating system or applications.
Using a dedicated hosting service offers the benefits of high performance, security, email stability, and control.^[1]
Due to the relatively high price of dedicated hosting, it is mostly used by websites that receive a large volume of traffic.^[2]