WANs tend to be organisation-specific, allowing an organisation to connect all its employees into one network regardless of their physical locations. The largest WAN is the internet , a collection of networks linking millions of computer users around the world. For more information about electoral uses of the internet, see The internet . An intranet is a WAN that is set up like the internet, but access is limited to authorised users only. For example, an EMB may set up an intranet containing in-house an website that is accessible only by the EMB, for administration and training purposes.
Intranets tend to be organisation-specific.
Extranets An extranet is similar to an intranet, but it generally allows users from several different organisations to obtain access. An extranet is used where data, particularly web-based, is shared between organisations, but the users do not want to allow unauthorised access to the general public, as is available on the internet.