What is the difference between three networks INTERNET, INTRANET and EXTRANET?

INTERNET is for sending messages and getting information to/from the world. INTRANET is the network within a closed group such as within a company. EXTRANET is the sharing of files with people in another location such as with a client.

Internet: The world-wide network of computers through which we're all sharing information. Example: Yahoo! Answers is an internet website. Intranet: An organization's internal network, commonly using many of the same services as the internet such as web and email. The difference is it is only available when connected to that organization's network. Example: A networked system for placing sales orders at a retail store, which can only be accessed from computers inside the store. Extranet: The bridge between the above two -- features provided by the organization's intranet which are also available on the internet, usually via an encrypted connection for security. Example: Warehouses which have their inventory systems linked so they can all check each others' current inventory. Only those warehouses have access to the system. Hope this has helped clarify.

computers connected in small area (ex:in a builing, companies). interenet is nework of all this networks(LAN, WAN, MAN, INTRANET, PERSONAL PC'S)

network between computers and networks all around the world is called internet. network in a small area is called intranet. computer or resources outside of a network is called extranet.

Internet is connectivity of computers far away from each other Intranet is connectivity of computers close by and mostly connected physically with cables.

http://www.iorg.com/papers/iw/19981019-advisor.html

Please check with Wikipedia before posting your question in Yahoo. http://en.wikipedia.org/wiki/Extranet

internet is a collection of networks linked togeter to each of them on the www intranet is linking of computers within an org. extranet is d 1 i too not have heard of.

Below is a explanation of these terms by "Steven L. Telleen" who had coined the term "IntraNet" at Amdahl Corp... Read on to understand the difference... The term "intranet" is somewhat misleading conceptually, because it invites a contrast to the term "Internet." The real contrast is with the World Wide Web--an important distinction, because "Internet" focuses on physical and technical networks, while the Web focuses on the set of content accessible on that physical and technical infrastructure. When I coined the term "IntraNet" at Amdahl Corp. in the summer of 1994, it did have the connotation of an internal Web rather than just an internal Internet. In fact, the term we used internally before this was the too-cumbersome "Enterprise-Wide Web." So, while the ambiguity of "intranet" was apparent even back then, for lack of a better alternative, it caught on. In the early days, I defined an intranet as "An infrastructure based on Internet standards and technologies that supports sharing of content within a limited and well-defined group." The "infrastructure" referred to the organizational and management infrastructure that created, managed, and shared the content. The only technical constraint was that the physical network be based on the Internetworking Protocol (IP). You might notice that this definition encompasses what we call extranets today, because the defining factor is a "limited and well-defined group," and does not specify any official organizational affiliation. The Web, in contrast, is an unlimited group. Today I think of intranets, extranets, and the Web as collections of content. An intranet is a set of content shared by a well-defined group within a single organization. An extranet is a set of content shared by a well-defined group, but one that crosses enterprise boundaries. These access distinctions are important, because Web-based content uses the same technical infrastructure regardless of access decisions. This means it is much easier to change access to specific content than it was in the old proprietary world,where making something more widely available often entailed a major conversion effort. As technical infrastructure becomes less of a barrier to accessing specific content, it becomes important to pay attention to how, or if, we want to restrict access. The terms "intranet" and "extranet," as imperfect as they are, provide us with conceptual and pragmatic tools for discussing to whom we want to make specific content available. These terms may continue to evolve in meaning. For now, a set of content accessed by members of a single organization is an intranet, even if the information travels across the public Internet infrastructure. You can find another article on the difference at http://www.hcidata.info/inet.htm You can also find a simpler animated version showing the difference at the following link... http://www.personal.psu.edu/users/p/h/pha108/myweb/Internet.htm Hope the above has been of help....