In Shared Web Hosting Model, your website is placed on the same server as many other sites, ranging from a few to hundreds or thousands. Typically, all domains may share a common pool of server resources, such as RAM and the CPU. The features available with this type of service can be quite extensive. A shared website may be hosted with a reseller
Virtual Hosting is also known as Virtual Private Server (VPS), in which server resources are divided into virtual servers, where resources can be allocated in a way that does not directly reflect the underlying hardware. VPS will often be allocated resources based on a one server to many VPSs relationship, however virtualization may be done for a number of reasons, including the ability to move a VPS container between servers. The users may have root access to their own virtual space. Customers are sometimes responsible for patching and maintaining the server.
In Dedicated Hosting Model, we provide your own Web Server and gain full control over it (root access for Linux/administrator access for Windows); however, the user typically does not own the server. Another type of dedicated hosting is Self-Managed or Unmanaged. This is usually the least expensive for dedicated plans. The user has full administrative access to the box, which means the client is responsible for the security and maintenance of his own dedicated box.