1. Virtual Private Server offers a good balance between total control (root access privilege) and a tight budget. Having a VPS account is just like operating a dedicated server.
2. Unlike shared hosting (a virtual host on a shared hardware server ) the file system is fully partitioned. This means that up-time is more consistent; while root access to the server provides the flexibility to add and change modules and to install your own software.
3. As cost effective as shared hosting: Partitioning a single hardware server into multiple servers is nothing new. In fact, mainframe computers have long been partitioned into multiples.
4. Total root privilege: You can start and stop any applications on your VPS, run any background process as you wish. With Telnet / SSH access you can do it all.
5. Freedom to install any software and configure your account the way you want it.
6. Security: In a traditional shared hosting environment, one account can access other's files when not secured properly. It is a well known fact that people can read other's passwords located in php files since they are all running under the web server's privilege, and gain access to sensitive data.
A VPS account (disk space, memory) is totally isolated from other VPS accounts, because each VPS account is located in its own "Virtual Environment". Other VPS accounts can not access your files nor data in the memory. You will have your own copy of apache, dns servers, database server, and user accounts. This VPS security model makes it ideal for secure credit card processing in e-commerce applications.
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