Price is perhaps the primary advantage of shared hosting. Since you're only using a portion of a single server, your costs are less than those for dedicated hosting. Also, since you are not directly responsible for management of the servers, you don't need to commit as many resources to routine maintenance of your website. This also means your hosting company will handle many of the security matters for your website; you don't need to make any direct investment in the software and hardware needed to secure the site.
However, because your website is on the same server as other clients, you have no direct control over the server as a whole, and certain site administration tasks may be more time consuming as compared to a site that is on a dedicated server.
Dedicated Hosting:
Dedicated hosting means your Web server is sitting on its own box, owned and managed by the service provider. Dedicated hosting means you will have more direct access to make different types of changes to your site compared to a shared hosting plan. The degree of host management depends on what exactly is offered by the service provider. Most providers offer special managed dedicated server programs that ensure continuous monitoring of server performance as well as routine tasks like data backups.
When you have a dedicated hosting solution, your website resides on its own server. This means that your company can directly control the machine and determine which Web applications are running on it. This also means that it is less likely that activities of other websites on the same physical server will negatively impact yours.
In addition, because the server only responds to client requests for information from your own website, there is likely to be a faster response time for the same amount of traffic across the server. If your server has a dedicated IP address, it will likely be easier to handle certain anonymous FTP and SSL encryption activities. Dedicated hosting arrangements are generally favored for high-traffic businesses. Because your website is the only one on the server, however, dedicated hosting costs are generally higher than with a shared hosting plan.
Virtual Private Hosting:
Virtual private hosting means that the server software is "virtualized" to permit the hosting of multiple websites on a single physical server (as with shared hosting), but each has its own copy of the operating system and permits greater customer access to the server (as with dedicated hosting). Virtual Private Hosting is generally available at a lower overall cost than traditional dedicated hosting, but provides the customer with much greater control and access to the website.
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