Internet, Intranet and Extranet

Internet

• The Internet is a worldwide network of computer networks that use the TCP/IP network protocols to facilitate data transmission and exchange
• The Internet carries a vast array of information resources and services and the infrastructure to support electronic mail
• The internet is not owned by any particular person or organisation
• Internet can be accessed by public via an ISP

Intranet

• Intranet is a private network maintained by a company or government organization and is based on the Internet Protocol (IP) to securely share any part of an organization's information or Network Operating Systems within that organization
• Intranet can only be accessed by specific users

Extranet

• Extranets are an extension of an intranet to allow access to customers and other users outside the organisation
• Extranet like intranet, but external access also available to specified bodies