Virtual private server (VPS) is the term used in the web hosting industry to refer to a virtual machine. Virtual private servers are similar in some ways to dedicated servers and are similar in other ways to shared servers. In a VPS service, the client feels that he/she is allocated a separate server for his/her website. The client is provided with a separate operating system and he/she can install any software that is permitted by the operating system. The client is also allocated separate resources such as CPU time and bandwidth. These are the ways in which VPS hosting is similar to dedicated servers.
In reality the client’s operating system is stored in the same server as many other VPS operating systems (of other clients). In other words, the client actually shares a single server with other VPS clients; similar to shared hosting. The difference between shared hosting and VPS hosting is that the client is allocated separate software and other such non-physical resources in VPS hosting. The functionality of the client’s operating system is not at all influenced by the presence of other operating systems. VPS severs typically cost more than shared hosting, but is less expensive than dedicated servers. Some types of software will not function properly in a VPS operating environment. Such software includes anti-virus software and firewalls. The web hosting provider may also place additional restrictions, but usually such restrictions are more lenient than the restrictions placed on shared hosting. The number of VPS clients who can share one machine is limited by the resources available in that machine (including processor speed and RAM).
Xmpp stands for Extensible Messaging and Presence Protocol. It was earlier known as the ‘Jabber’. The main purpose of xmpp is to provide extensible instant messaging (IM). It is also used for contact list maintenance and presence information. Although it was not originally present, xmpp has been extended to support new features such as Voice Over Internet and File transfer. When compared to other IM protocols, the specialty in xmpp is that it is an open systems protocol. This means that one xmpp service can be incorporated with other organizations’ services. Both the software and most other additional applications are available for free download.
Xmpp uses a decentralized approach. This means that any person can implement and maintain their xmpp server; there is no central server controlling the whole network. There are many security features implemented in xmpp. Xmpp servers can be isolated from the public network. This is useful for running an intranet service. Tough security specifications have been built into the xmpp software. Client-server approach is used in xmpp to facilitate communication. In this approach, any two clients will not be able to communicate directly with each other, but will have to communicate through a server. However, unlike some chat services, there is no centralized server controlling all communications.
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